I just found the answer to all my DC problems for the new quests:
Acid savant and Acid Draconic Incarnation. Tank up with some HP, spam Waves + Icestorm on every group of mob and tank in Acid Rain until EBurst is off-cooldown. No saves required, no gear investment other than a TF dagger (which may take a while).
I'm not kidding. The most hated Savant is actually the best option if you want to play any kind of Sorcerer in the new content.