Well we got him down on the second try on 10m.
We whiped because our dps did not focus on getting the healers down that way we did not have the 2 tanks (Me and a pally) able to stay high on health (We had about 42k Buffed both). The second try we really got or dps to focus and we got him down.
Also the reason to repositionate him in the middle again is he can do a massive cleave that will do 200% damage to 1 target or 100% melee damage to 2 tanks... so if the dps stand infront of it, and im assuming he takes the same formula as the faction champs in totc 10 he will hit the dps more likly then the other tank. Also make sure you DO NOT stand in the fire, it does crazy amounts if you dont have any frost protection active.
Further more we had 2 teams run him (i was on T1) the trinket droped which gives you 2k mana and the tank weapon. On T2 the same things droped.
There is no "ctrl" on Fluxx his keyboard... Fluxx is always in control.