Naturally, you will want to keep bossing Corpse Explosion by having an Infinity merc, which also helps your CE's fire damage, and your mages' damage, your melee summons' AR through reduction of defense (-83%), and finally have a great Crushing Blow amount, coupled with Guillaume's face.
Decrepify is more suited when facing the act boss. A naked summoner is already good the gear isn't as important as a solid playing-style. Regardless of whether or not you have expensive rune-words, you should be having very few problems killing things. You should also be using Amplify Damage and Decrepify, from your Curses skill tree. An Act II Might mercenary is your best friend.
