Not only will the 50 dex will cap out any acc you may need it increase your melee dmg alot (like nearly doubles ur melee dmg)

Griffin claw i may not of worked out the numbers but this gives me the largest boost to my overall WS DMG with a +10acc/atk boost as bonus.

Honestly i'd never use SA since u should have fstr capped with VV and i can cap attack easily enough with endark/food/temp items also if i need attack i'd use AO.

My best performing atma are VV RR griffin or VV Apoc Griffin
But for events i usally just use VV RR and sea daugther so i can cover all the red staggers.