Probably way too late since I wasn't in Beta but....
Is it possible to get maybe an AA to extend just our top end Stun to a couple levels above even?
Mages get an AA that lets their pets stun up to 2? levels above them.
I was being out tanked in Cooling Chamber by 2 mage pets. Now I know I'm gimp at only 5200AC but I should tank better than mage pets I would think. Merc cleric too so its not an impossible fix but a single stun, mitigating 4-6 seconds of damage every 14 seconds would go a long way to making it survivable without making it trivial (10k hitters).
Just tossing it out there. Thought Cooling Chamber was T6 but I guess its poorly tuned.