first at all, what you need is a rotation of cd. first make 1 warrior use rallying cry, that will help a lot, next use a tranq, the one from the spriest. Stack close to the border(range and healer). The tanks can eat up 2 breaths before swap, then the tank that leaves the boss, can reset stacks outside and enter again. When you reach 30%, pop lust, another rallying cry. Use aura mastery at 10%, in there you will eat a lot of damage, tranq again(if your druid is not tanking elegon he can tranq at 20% to help).
I hope this helps, of course, if you kill the pillars ASAP, you will get no problem with the adds. If the adds are a problem, you should stack in the console, then when the floor is on, a tank runs to the boss(that will avoid the grip), and the raid can kill the adds faster.