I've found making friends with Scholars helps. They're really good at keeping up with the healing from the AoEs. Other than that, as mentioned before, stay away from the middle (some hits are unavoidable anyway and taking damage is better than getting thrown off the edge.) And kill the heart IMMEDIATELY.
I had pretty good luck with Titan, but there are other story quests that it took me MANY tries to get through, so I feel your pain. Good luck out there!
