I haven't tried this build but I think it might work better without crit.
Use AGI > INT & VIT> DEX (DEX optional)
The DEX is only so you don't miss, but Ultimi may give enough as is.
For gear use Ultimi, Chignon ribbon*, Stake Knuckle*, and Richly Colored Bracelet*
and 3-5 Dullahan Xtals
* gear isn't out yet but will be soon enough.
The idea is that since the stat 'Physical Power' is added to damage and not multiplied by CRT or reduced by defense, maximize it and free up stat points from CRT. All the gear here adds physical power allowing you do decent damage and freeing stat points up for VIT. You would have lots of HP and a strong heal, In theory this should be the best solo build.
Chignon ribbon doubles ASPD for claw users with no penalty
Dullahan xtal adds physical power by ASPD and boosts heal a bit,
Ultimi up and re up are coming later... its final form gives +800 physical power
Richly Coloured Bracelet adds physical power by Agi.
Stake knuckle seems to add about lvlx9 physical power... Its a physical power themed claw.
Maxing AGI gives decent evasion on top of maxing VIT gives excellent HP with Max INT for a strong heal and mdef... pure tank monk with decent damage.
Rough math suggests that you would be getting 3k-4k damage a hit from physical power alone. On high defense bosses you be the only one doing damage too (which is very monkish in this game anyway).
Shell break is less relevant when all your damage ignores defense in the first place.
Geo and Buryu wont do as much damage but you will be tough as nails.
After stat release you would want to focus AGI... gaining more phys.power from all your dullahans, your braclet and also increasing evasion.
Note: the Minstrel buff that adds ASPD adds A LOT of ASPD and hasn't been tested with 3-5 Dullahan Xtals equipped, it may be reasonable to imagine it will increase physical power damage damage by a lot.