I'm not sure if it's the best idea in the world but Arcane Explosion seems to destroy the imps, I was going Oom in P2 from spamming it too much. I also used Lust/Potion midway through P2 when I realised it was pretty low (32%) and burned a fair bit then. Had PVP Badge trinket, can't remember the other one right now. Potion was a MoP Intellect one, they don't give much less Int than the SL ones. My only issue was running into about 3 boulders at the end life an idiot, but otherwise had no issues.
https://www.wowhead.com/guides/fire-...allenge-agatha - Talents/Gear/Tips etc on here are pretty good and what I followed.