There are four tips to this fight that must be adhered to if you want to succeed:
1) Get the damage reduction buff set out this way: force the first two on your tanks (one each), then casually let one float around to everyone else. If one lands on your tank for a 2nd one, let it expire. The goal is to get 1 stack on your tanks before the first plate ends, and that gives your group plenty of time. However, if everyone doesn't have at least 1 by the time you perform your flip after the second plate, people are going to be hurting.
2) Cooldown management should be very simple...they need to be used when performing a barrel roll as this is when you should be slaughtering any remaining bloods. Divine Hymn, Tranquility, Totem, any tank 4 piece bonus, etc. When your amal tank gets comfortable with his role, he should be listening for DBM's countdown to the roll. When the group runs to the side to initiate the roll, your tank should be in the middle of the spine. You should start staggering CDs...defensive CDs reduce the blood burst damage and healing CDs get rid of healing debuffs remaining. When the DBM timer gets to 3, the amal tank should move from the middle of the spine towards the group collecting all of the blood residue. He should arrive to the group just as the barrel roll is performed removing all remaining bloods from DW's back and leaving your group without any debuffs and in great condition. Mind you, this type of roll is only performed twice (between 1st and 2nd plate and between 2nd and 3rd plate) so while it seems like it's crazy, it really isn't that bad. All of your important AoE CDs are on a 3 minute cooldown providing ample time to get them up for the following one.
3) Dispel duty should be on your Priest who can glyph a heal with it. If you don't play with a Priest, your weakest healer should be on dispel duty. Hopefully it isn't your Paladin, because Paladins are wicked for this fight. Don't forget Hand of Sacrifice on Amal tank, Hand of Protection for casters, and all the other wonderful tools they have. Resto Shaman's Totem CD is unparalleled during the barrel roll transitions as effective healing is still performed despite the healing absorption debuff.
4) Relax...while this fight is difficult, it's monotonous as well. All you have to realize is it's the same exact thing as normal except you take more damage, have to do more damage, have to be cleaner, and 1 healer has to handle dispels. You just do 6 lifts. Also, no talking in Mumble/Vent unless you have valuable information to provide. If someone is on back up duty for grips, it helps to announce a grip is coming in 3 seconds so he can prepare. If a healer is popping a potion of concentration, the other healers need to pick up that slack. If the dispelling healer is gripped, another healer should be ready to pick up the dispel duty. Stay relaxed, perform the fight as normal, and realize that once you down it, you're basically done with this expansion.
Cheers, and good luck. If you post your specific group comp, I can help you with CD timing and raid assignments.
Edited by Zagam, 11 July 2012 - 01:11 PM.