Slow time elemental damage is based on the highest elemental damage you have to proc the Tals meteor. From my experience if you have an equal amount of arcane and fire, your slow time will be arcane. Not sure how this goes with equal amounts of cold and fire. You'll have to test it out.
A couple of things about your current build. You are running a DelRasha hybrid. But you don't have any skills that help to pump out more Slow time bubbles. That's the point of it. Get as much out as you can and surround yourself for protection as well as damage. You don't take advantage at all with the Del 2 set bonus and getting as much cooldown as you can to get out those bubbles so using Electrocute is not good. Magic Missle - Glacial Spike is a typical generator that DelRasha builds use. You could also use Shock Pulse - Piercing Orb. But remember to pick one with a particular element that you don't already have as a skill for the Tal Rasha bonus.
If you haven't seen rebjorn's build, you should take a look. He has so many variations on the hybrid build and you don't need a specific weapon for it. He's got a ton of videos as well. http://www.diablofans.com/builds/54387-delrasha-gr50-4pc-delseres-6pc-tal-rashas If you like using Hydra he has a version with the Hydra build but uses a Serpent Sparker, but you could still make use if it but might cap you off at a certain GR level. Watch his videos on how to play it. He's actually very offensive with his bubbles. Not just surrounding himself for protection but seeking packs.
As for survivability, you really need Energy Armor - Force Armor even with Unity. Ice Armor - Crystalize is really only good with the Halo or Arlyse ring.
As for items, a better RROG with crit stats. If you have another pair of gloves, that resource cost reduction is kind of a wasted stat because you aren't spamming a ton of arcane spenders. If you have gloves with Int, Vit, CC, and CD you will want to change that Vit in your amulet to CC. Or if you have gloves with Int, CC, CD, and CDR you can keep Vit in your amulet.
For gems, typically Taeguk is used when you spam a lot of spenders to keep the Taeguk stacks up. The hybrid guide above will explain which gems that are typically used. I have used Bane of the Trapped, Zei, and Toxin.
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I have this problem too. I can offer some suggestions:
Don't keep any non-ancient weapons, UNLESS they are super duper good (or very rare) like a Furnace or a Starmetal Kukri. If they dont' have any special abilities (just a plain weapon) consider getting rid of it for sure.
Don't keep any armor pieces that don't have special properties, by which I mean consider holding onto your Strongarm bracers, Ice Climbers, anything that is crucial for a build like WD mask of jeram. And only if they are good versions with the proper rolls. One caveat is some items have abilities that aren't "legendary abilities" and don't show up as the orange text, they are just normal abilities that are specific to that item. For example, Eye of Elitch that has high reduced ranged damage, Stormshield with high reduced melee damage, etc. Consider keeping those kinds of items if you have good one.
Don't keep any crafted items.
Set items: I tend to hold onto all my set items because they can become really useful with future changes to skills, and set changes tend to be retroactive.
Non-set items are not "future proof" because changes do not tend to be retroactive so there is no need to horde sub-optimal pieces hoping they will get better.
Rings and Amulets with sockets are better to hold onto than non-socketed due to legendary gems, so if it's got good rolls and can be socketed, I tend to keep it. Also you can put them on your followers for an extra place to hold them.
Mules: I have experimented with making mules but it's very annoying, I forget what items they have and changing back and forth is very annoying. It doesnt' solve my problem because I still horde stuff in my stash and forget about what's on my mules. I do still have one that I use for surplus crafting mats and novelty items that aren't useful but nice to keep, like I have all the reagents for making the Staff of Herding for some reason.
I know that I've disposed of items that I now regret, it's inevitable... but it's something you just have to deal with. Being slowed down by a full stash and agonizing over what to keep vs discard slows down the overall progress in the game and keeps you from finding that next amazing item. Anyways I hope this is helpful!
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You said you only got 4 ancients out of 60, but the stated chance of getting an ancient by blizzard is 10%. Of course, this 10% rate "COULD" be wrong, but your experiment does not necessarily support this. Like others are saying, an N of 60 is much, much too low to make meaningful conclusions. To illustrate, lets do an experiment with dice. If you assume a 10% chance of getting an ancient, that's like rolling a 10 sided die and getting a roll of exactly 10 (or any other specific number, I'm just choosing 10 arbitrarily). So if you rolled 60 of these 10 sided dice, you'd EXPECT to see six 10's because 6/60 is 10%. When you simulate this, you do not get six 10's every time, because RNG. Here is an example where I simulated rolling a 10 sided die, sixty times, and then repeated this ten times, and counted the number of 10's that came up each time:
10 - 1 - 5 - 2 - 10 - 9 - 8 - 2 - 7 - 5 - 2 - 2 - 1 - 7 - 2 - 1 - 6 - 5 - 8 - 10 - 10 - 6 - 5 - 7 - 3 - 10 - 6 - 4 - 1 - 2 - 2 - 2 - 8 - 4 - 2 - 10 - 1 - 1 - 9 - 9 - 1 - 6 - 6 - 5 - 8 - 8 - 2 - 2 - 8 - 8 - 9 - 9 - 10 - 7 - 3 - 4 - 6 - 9 - 10 - 10
3 - 4 - 1 - 6 - 4 - 1 - 5 - 8 - 5 - 3 - 1 - 6 - 6 - 9 - 9 - 4 - 1 - 1 - 9 - 6 - 8 - 5 - 7 - 4 - 3 - 3 - 2 - 1 - 1 - 8 - 4 - 2 - 2 - 10 - 7 - 7 - 6 - 10 - 2 - 8 - 3 - 5 - 8 - 5 - 7 - 4 - 4 - 2 - 9 - 10 - 4 - 6 - 10 - 4 - 3 - 9 - 8 - 7 - 3 - 1
9 - 4 - 7 - 7 - 10 - 9 - 4 - 7 - 2 - 2 - 8 - 1 - 10 - 2 - 3 - 3 - 7 - 2 - 7 - 10 - 10 - 1 - 3 - 2 - 5 - 8 - 3 - 8 - 7 - 8 - 10 - 9 - 8 - 1 - 9 - 9 - 9 - 1 - 6 - 9 - 10 - 7 - 10 - 7 - 2 - 3 - 7 - 8 - 2 - 10 - 2 - 7 - 1 - 3 - 2 - 9 - 2 - 5 - 3 - 2
7 - 7 - 10 - 5 - 3 - 10 - 4 - 9 - 4 - 4 - 5 - 7 - 6 - 9 - 1 - 3 - 1 - 7 - 10 - 2 - 1 - 5 - 6 - 8 - 7 - 4 - 9 - 5 - 10 - 10 - 8 - 4 - 9 - 4 - 2 - 3 - 8 - 6 - 4 - 3 - 9 - 9 - 5 - 8 - 5 - 6 - 1 - 2 - 3 - 10 - 8 - 5 - 6 - 1 - 1 - 2 - 1 - 2 - 8 - 10
1 - 10 - 10 - 4 - 6 - 1 - 9 - 3 - 7 - 8 - 6 - 6 - 3 - 7 - 3 - 3 - 10 - 9 - 3 - 1 - 4 - 7 - 3 - 1 - 2 - 3 - 9 - 8 - 3 - 1 - 3 - 6 - 8 - 5 - 2 - 10 - 9 - 2 - 2 - 5 - 8 - 8 - 5 - 5 - 4 - 3 - 3 - 9 - 8 - 9 - 2 - 3 - 10 - 8 - 7 - 5 - 8 - 10 - 2 - 3
3 - 1 - 10 - 7 - 6 - 10 - 8 - 8 - 5 - 4 - 5 - 9 - 7 - 9 - 4 - 6 - 3 - 8 - 7 - 10 - 1 - 10 - 10 - 5 - 9 - 10 - 7 - 1 - 9 - 8 - 3 - 9 - 10 - 9 - 3 - 7 - 9 - 9 - 10 - 5 - 6 - 5 - 4 - 5 - 4 - 4 - 7 - 2 - 4 - 1 - 2 - 10 - 4 - 3 - 3 - 3 - 2 - 5 - 9 - 6
4 - 8 - 10 - 8 - 2 - 6 - 10 - 8 - 7 - 8 - 7 - 5 - 9 - 2 - 5 - 6 - 6 - 6 - 1 - 5 - 4 - 5 - 7 - 8 - 6 - 3 - 6 - 7 - 7 - 10 - 6 - 4 - 10 - 4 - 1 - 8 - 6 - 7 - 4 - 9 - 5 - 9 - 5 - 7 - 5 - 8 - 2 - 2 - 9 - 7 - 8 - 6 - 4 - 4 - 3 - 9 - 1 - 2 - 2 - 10
10 - 3 - 1 - 7 - 3 - 3 - 5 - 6 - 2 - 7 - 10 - 9 - 3 - 3 - 1 - 5 - 1 - 1 - 4 - 9 - 1 - 4 - 9 - 10 - 3 - 10 - 1 - 7 - 1 - 2 - 8 - 5 - 6 - 4 - 9 - 2 - 9 - 9 - 5 - 2 - 4 - 7 - 1 - 3 - 8 - 9 - 4 - 2 - 4 - 8 - 9 - 10 - 8 - 4 - 9 - 6 - 5 - 2 - 5 - 3
3 - 9 - 5 - 10 - 9 - 6 - 4 - 9 - 5 - 9 - 7 - 2 - 7 - 2 - 5 - 5 - 4 - 6 - 3 - 4 - 6 - 10 - 4 - 4 - 3 - 8 - 7 - 3 - 6 - 3 - 8 - 7 - 4 - 2 - 9 - 6 - 3 - 1 - 4 - 2 - 6 - 6 - 7 - 5 - 2 - 7 - 4 - 6 - 9 - 5 - 3 - 9 - 10 - 2 - 8 - 4 - 6 - 2 - 7 - 2
9 - 1 - 3 - 2 - 1 - 10 - 9 - 5 - 4 - 10 - 2 - 4 - 3 - 1 - 9 - 1 - 3 - 9 - 2 - 7 - 5 - 1 - 4 - 1 - 1 - 10 - 8 - 3 - 5 - 6 - 1 - 2 - 4 - 2 - 4 - 5 - 3 - 5 - 4 - 2 - 9 - 9 - 3 - 9 - 3 - 9 - 6 - 9 - 4 - 7 - 2 - 7 - 10 - 1 - 8 - 8 - 8 - 2 - 2 - 2
Counts of how many 10's appeared for each set of 60 dice rolls: 9, 4, 8, 7, 6, 9, 5, 5, 3, 4
Your result, 4 out of 60 ancients, appeared twice. The expected number, 6 out of 60, appeared once. The range was quite wide too, as high as 9 out of 60 (15%) and as low as 3 out of 60 (5%). However, if you add up all the dice rolls there were exactly 60 out of 600 appearances of 10, which is 10%! This seems quite lucky as I'd expect to be slightly off 10% even with 600 trials, but I guess that's RNG for you.
This doesn't prove anything about diablo 3's drop chances, it just shows that low sample sizes are expected to give highly variable results. So getting 4 ancients out of 60 legendaries is entirely consistent with a 10% drop chance. It doesn't prove it is 10% and doesn't prove that it's not 10%, but it is one result you would expect.
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I'm no crusader expert (I play Barb mostly) but I was in pretty much your situation very recently. I had a crusader that I could only do about T4 or T5, I felt squishy and tended to always run out of wrath. I too liked using fist of the heavens but it ended up not really working for me so I gave it up.
Now I am using the stampede build and T6 is easy. In my case, I quickly gambled an unrelenting phalanx crusader shield, I've gotten several more since including an ancient one but I'm still using the one on my current profile because it has CDR and phalanx damage. Then I set about building up my Akkhan's set, first using my barb to farm blood shards to gamble, but this ended up being inefficient so I started using my crusader to farm rifts. I got most of the pieces from shards, and the rest from drops. It was quite hard, I kept getting Rolands set pieces over and over!
I literally just got full Akkhan's the other day so it's not optimized, but it works so well! My CDR allows 100% uptime on Akarat's by using a Leoric's helm, Gogok of swiftness, and vigilante belt. You are right, the gear is rather specific and crucially important. Without Akarat's I quickly run out of wrath. I guess I was lucky because I carried certain items over from my barb.
I'd say that having the leveled legendary gems is pretty important, especially Gogok's, and using it appropriately by first building up your stacks before hitting Akarat's and keeping an eye on the cooldown vs. stacks. Also having dual unity, as you mentioned, is very useful for damage mitigation. Using the Templar with his heals and/or wrath regen is great too.
As far as other classes go, Raekor's barb may be comparable because it needs the set items plus vile ward shoulders to work well, but I feel that it's a bit easier to get running than Stampede (having now done both). For Raekor's, CDR was the main issue I had, along with finding some vile wards. Now that it's changed in 2.1.2 it might be quite a bit easier to manage than Stampede, at least for me. I also have a Jade WD which I found very easy to get going, once I collected all the set pieces. I made it work okay with just the Jade set helm, but then it got a lot better with the Tiklandian voodoo mask. Also I very luckily found a decent Furnace on my WD (very lucky!). Never found a Quetzalcoatl though...
Probably very true. Can you link your profile? It's fun to drool over the epic gear on the leaderboards, but it's possible to make things work with lesser versions. Sometimes it's as simple as reaching a certain CDR breakpoint or using dual unity or something. Since the rarest drop rates were buffed in 2.1.2 you may find it easier now to get the right gear. In my case, probably a week or so worth of farming rifts radically transformed my crusader. Good luck to you!