85% is about where we're getting Kel'Thuzad, so I feel your mid-80s woes. There's a reason Twin Emps are so often referred to as a threshold fight in terms of end game difficulty. Takes a fairly unprecendented level of raid coordination to get everyone doing the same thing.
Invaluable learning tip: have your healers bring major fire and frost protection potions and pop them before the fight. Helps a lot mitigating a stray bug or a bad blizzard.
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