Sorry for the potentially dumb question (this may be common knowledge that I am just now discovering) but does Blizzard lower the difficulty for Grifts when played by 'Seasonal' characters. The reason that I ask is because when I try some of the "(2.4.1 GR 80+ Solo builds - with video)" and see characters with several hundred less PP than my main toon (but roughly equivalent gear) I am astonished at how easily these "builds" seem to work with Seasonal characters but fail utterly with my character when I try the same build with the same gear and significantly higher Paragon level to boot. (For example my Paragon 922 character could not complete a GR in time at level 63 using Quin's "One Shot Monk" build (which I've used earlier variations of now and then) and yet I just saw a Seasonal character annihilate a level 77 GR using virtually identical 'One Shot Monk' gear but ~ 200 lower Paragon level.
Nearly all of my gear is Ancient, and I just happened to have virtually 100% matching gear for the One Shot Monk build but 5 minutes into level 63 with this build and my timer bar was split half purple, half tan (tan, the color of failure). On a side note, my first attempt with this build was at GR 70 (since I've actually completed a lvl 70 solo GR with a different build) and was killed 3 times at the dungeon entrance before Alt-F4'ing the game (just before being slaughtered for the 4th time in less than a minute).
To be sure, I don't consider myself an outstanding D3 ROS player but having logged over 1000 hours on my main toon I'd like to believe I have a basic understanding of how to play (a Monk anyway).
So could it be that Blizzard makes GRs a little easier on seasonal players or I do I really, really suck at D3 (or perhaps both)?
Note that I'm not complaining, it makes sense that Blizzard would (and should) cut the seasonal players a break given the relatively short lived seasons but if they don't then I obviously need to stop playing D3 and stick with my Super NES or maybe go back to coloring. (wouldn't be the first time something like this has happened, probably won't be the last...
Personally, I have never noticed any difference in the difficulty levels between S and NS. 1 thing that comes to mind is that we are still in the early stages of S6 (patch 2.4.1), in which mob difficulty was decreased (mobs deal less dmg). Due to the nerfed mobs, it should be easier to climb higher in 2.4.1 as opposed to 2.4. So basically, make sure you are comparing NS6 runs vs S6 runs.
On the topic of One-Shot Monk:
+% WoL rolls have a huge impact (as does placing the initial cast - pinto's), so keep that in mind.
If you want to continue with this build for GR (it is usually only used for TX speed), I would recommend keeping nems in your inv and then cubing something else in armor slot (cindercoat for RCR/ magefist for % fire dmg/ aquila cuirass if you can maintain your spirit well enough/ etc.)