There's a 200+AP (Depending on Opponent's meter) Reset combo using what's shown in this video...Will upload soon!
Dante is...really bad in FFA, not too sure about 2v2, but is a total monster in 1v1.
Don't think he really needs a nerf, since all his good stuff requires a fair amount of effort. Actually, I think He may need a buff
Armor at the start-up of Angel boost would definitely help him out in FFA, and so would being able to go from Square to triangle on block (Would not make him OPed due to the fact that his bullets has no hitstun...so he can still be outmashed). Both of these things would increase his chances of survival in an FFA enviroment!