I generally run the 10 and 25 man modes the same way. 1 Tank on both melee bosses, 1 range tank on Kel. Every melee and range sets in place their scatter locations and lock it down as we hit the Vortex fight portion. Melee then hit the chase portion and the X runs like hell. We blow heroism on the 2nd or 3rd rotation of the range tanks target depending on current threat levels. We managed to down it in less than three full rotations last night with a single death due to a empowered vortex and empowered fireball hitting within about 8seconds and a missed Orb hitting the ground. We do plus up to 8 heals with the other tank swapping roles on this fight.