It's EE its meant to be challenging, not just a mindless wading into each fight spamming 5 spells and moving on, EE Tor is a challenge, requires smart game play and tactics. I say make no changes, casters should be squishy and die easy, tanks should be able to just about survive end game mobs.
I love EE content on my cleric, he can survive because i designed him that way, I can't solo EE content, nor would I want to. I want to rebuild my squishy characters so they can actually defend themselves, this is the first time since I have started that I actually want to try to and develop my characters, before I never needed to.
EE should be ELITE, hard is easy, and I am happy with it how it is.