It’s a shame that 'sins don’t really have claw attacks for dealing physical melee damage. The wind up skills are just normal attacks and the spender’s are mostly kicks.
So - perhaps Claw Mastery needs a significant buff so it can enhance her charge up attacks to be solid single-target damage dealer
Adding stun duration with greater buffs to %crit and %dam so people spend points in it.
Also it could enhance Blades or provide a synergy
If Paladin’s can get +420% from concentration for themselves and their parties, then I think assassin’s Claw Mastery can be significantly buffed for the paltry few attacks she does with claws.