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as for an armor advice you can either run Enigma (i do so) but thats not the big toughness or damage. Just teleport

or a standart fortitude/CoH

or what works very good for survival is a...

im not sure if it works vs lichking for example. I know he is immune to curses. Probably this is the weakness of acid injector.

but vs dreamland bosses it seems to be fully effective. I kill those...

mephisto is right. The acid inject isnt affected by any +% or +dmg mod. Its a plain and simple "curse"-based spell that lowers your liferegeneration. And liferegeneration thing is put on a number...

You should try another weapon i guess. Frostmourne dont have much +xxx damage and only the 40 cb from 2x Ber... Ita good for inferno or physical immunes but not that good vs bosses.

As a tipp: try...

Lifetap is bad for this boss. Change draculs out and maybe add saracens to your heart of the shadow to have a fast amp. dmg procc. This way i killed him my first times with smiter. Full dmg, no...