http://www.youtube.com/watch?v=NszoPZrEZ_0
Pov SMN twintania. Here's a video where I show the dps rotation and important tips on critical phase. I hope it'll be of some help.
Keep in mind that I only wrote about the most important things : how to have a good dps on each phase. The optimisation e.g. virus/dps fluctuation if fireball is late etc should be done accordingly to the fight and learnt (I do it in the video but I'm not commenting on it).