This build will provide massive amounts of +% DMG to all attacks, while focusing on Lashing Tail
Crippling Wave: The first 2 attacks will be used to apply the Alabaster +DMG modifier to your targets, if you're surrounded I hope this can manage to be applied to 180 degrees for each strike so all mobs surrounding you have it.
Deadly Reach: The 3rd attack will be used at least 3 times for the Crimson +DMG modifier to stack to 30%. After the buff is acquired, you can switch to using the Crippling Wave 3rd strike. Then just reapply after 17 secs (your next encounter)
Lashing Tail Strike: This will be your bread and butter. With a Crimson this will do massive amounts of damage when coupled with all the +DMG modifiers you have stacked up. This appears to be a 360 degree ability and will keep you safe with the knockback.
Dashing Strike: I'm usually not a fan of knockback abilities, especially in D2. But with Dashing Strike you'll be able to get right back onto your next target no problem. Add a Golden runestone and Spirit isn't an issue.
Serenity: This build lacks any sort of utility or self preservation. This is your "Oh Shit" button. Add in a Crimson for it to heal, and you have a 3 sec invulnerability window to Dash your way to safety, if the heal isn't enough.
Mantra of Conviction: This build wouldn't be complete with out it. Add in another Crimson for a massive +DMG boost and when it's all said and done we have a Huge +185% DMG to all attacks, especially the 312% weapon damage Vulture Claw Kick.
Transcendence: I'm torn between this and Chant of Resonance, but the constant passive healing will be really nice, especially for this build.
Exalted Soul: I'm putting this one here for now, but I think once you hit nightmare and above One With Everything will be too good to pass up.
Beacon Of Ytar:: The cherry on top for this build. Removes the cooldown for your Lashing Kick, allowing you to Kick > Dash > Kick until your spirit runs out or your enemies are dead.
Nice build, I really like that you put that much emphasis on LTK. I agree with you that so far LTK seems to be his best (i. e. most reliable/efficient) nuke. There are a couple of things I'd change in your build though:
1) Drop Exalted Soul, you most probably won't need it.
2) About the +80% damage on CW... There are some serious doubts among the Monk community that this debuff applies to ANY hit of CW. Since the description reads "affected targets" it's likely that only the third hit is supposed to trigger it because that is when the actual effect of this combo kicks in. I guess we'll have to see but from a balance point, it seems highly unlikely that the first hit would debuff for +80% received damage.
3) You're using a lot of Crimson runes in your build. We don't know about the drop chances for now, but I don't think you'll have an easy time finding that many high-end Crimsons. But that doesn't really matter, you could just as well use others:
3.1) Replace Crimson in LTK with Obsidian. Same damage, no stupid knockback, slow (in case you have to run) and I like physical dmg more than fire damage but that's just a personal preference, I guess.
3.2) Think about replacing the Crimson in Serenity with something else. Healing should be okay with Transcendence and probably LL. That would free a slot for some defensive passive so that you don't have to rely on Serenity that much in the first place. OWE would do just fine.
Anyway, cool build. I'm glad someone else sees potential in LTK, way to go
Exalted Soul - You're right this probably won't be needed, especially if there's +spirit leech of any kind. I just thought being able to spam those extra Lash Kicks would really be very strong.
CW - I guess we'll have to wait and see if it affects the targets or not. I was assuming so since it didn't specifically say the third hit like they do with all the others. It would be too bad if it didn't work!
Crimsons - Ya lots of Crimsons, but this is an ideal setup
Crimson in LTK - My main reasoning for choosing this was the fact that it appears to be a 360 degree of attack, while Obsidian is just a cone. And while i'm not a fan of knockback, having the Dash ability to close the gaps will help remove the annoyance.
Serenity - I'm pretty stuck on having this in the build, especially once you reach hell and beyond, I really do think it will be invaluable. And I like the heal, since you'll only use it if you're about to die anyways.