This takes some practice. For first time in 2 days we saw the 3rd troll phase, just to die on the frost orbs ^^. P2 is the hardest for us. Effiwhatever are all over the place, kind of pain to pick up as a tank, when at the same time you will have to pick up the other trolls. Where do the effiniwhatevers come? As I saw there were horrible number of those and the 2 priest spawning at the same time wasn't nice as well x_x
Things improved if put our priest into MD duty in p1 to get rid of the sun beams and also told the DPSers to save their CDs for the dinomancers. We have a long way to go to get all phases down perfectly, but p1 is down more or less, p2 is almost sorted as well.
By the end of the day it gets bits frustrating, at least to me, when you have to pick all the adds that are munching on someone they are not suppose and and everything for taunting is on CD when needed.
We are 490-496 geared 10m grp, but our 4 top DPS can pull their weight, we just need bit more focus and paying attention. But there are some useful posts in this 26 page thread, which I believe helped us along abit.