I liked your post. Your post gave me an idea:
What if the A-P was cured slightly for melee damage they dealt? Maybe in the 5-10% range. Maybe 5% at level 30, +1% every 4 levels, with 10% at hero? Could call it "Pain Siphon". Or for another twist, make it only for ordinary attacks, i.e. cleave, slash, thrust, whip, no freezing/defilement/searing, and call it "Bloody Baptism" or "Blood Bath" or something like that. These sort of fit in with how I see A-Ps as being focused on all elements of loose and careless mayhem, and encourages straightforward brutality.