@Kittycovox: Twins is easy as tank. I use to tank the boss and the beast in P1. OT taunts off, when beast spawns on me and i went out a bit. Advantage is, you can hit ranges before the barrage with HolyPrism, because using it on the boss doesn't hit ranges and melees don't take considerable damage.
In P2 just place yourself next to a meteor and make sure, she has the Frozen debuff (don't know the english name) and so loses fire-stacks. Use unglyphed DP for the 2nd fan of flames. I use speed of light to get behind the meteors for inferno. We always used the Tiger (slow) for the first inferno, because every 2nd try the 2nd meteor doen't spawn before the inferno. In P3 tank the bosses together and clear the stacking fire buffs via meteor. Let ranges/healers stay spread. Use slow for the first tidal waves. Throw all raid CDs for inferno/cosmic barrage, you don't need them later. P4 = P1 without the funny rogues attacking the raid from shadow.
After all the fight is all about ranges not dieing. Feel free to use 7 healers.