We are using 3 tanks at this fight. Warlock and Hunter are rotating till I (Blood DK for this fight / full stamina gear) got 14 stacks. After that it is easy to stack up till 20 and the healers have only to heal me cuz warlock and hunter will drop the stacks. And there is no tank change necessary because I will tank the add with cooldowns.
When I got around 14 stacks I will go to the boss. at 16 seconds i will move out again to restack the debuff. Short: Warlock and Hunter are rotating -> Warlock and Hunter will drop Stacks -> 14 Stacks -> Boss -> [around 16 seconds left] go out to restack -> boss and so on
We tried over 20 times the 2 tank tactic after we changed to 3 tanks it took us 5 tries.
http://www.worldoflogs.com/reports/0...?s=8457&e=8838