[Caboozles]

I'm going to take a second to say I don't agree with most of these changes because they impact PvE too heavily, and too negatively.

Nerfing teamwide aoe or adding cooldowns before you can get any healing may be great for PvP balance, but I'd say this would gut a lot of your ability to beat these bosses with suboptimal setups. Sometimes you need to heal twice in two turns to keep people alive.
This especially hurts evades who are already on life support in PvE content where bosses have more hit than god and you WILL take damage unless you're maxxing out your debuffs/buffs, and even then the unavoidables will hit you for 200+ before appropriate elemental resistances. (Welcome to Lazarus is fun)
(Adding a 30 turn limit before healing doesn't work also is bad because of high end PvE bosses too)

I'd rather efforts on nerfing healing in PvP center around making counters more plentiful, maybe tweaking healing discharge because that one IS a little absurd, and probably taking a pass at spellthief.