I don't agree with Bloodbath lovers. Bloodbath is better than avatar on single target, and when the dps line is linear till end. But, Avatar is far more superior than BB on lei shen, like rest of many other fights.
Avatar is better on Aoe based fights or like, horridon tortos magaera twins and lei shen. If singe target fight is around 3.20m-4.10m, avatar is better. 2x avatar > 4x bloodbath, don't forget it. Also avatar at start with full proc and avatar at execute phase with 2nd pot is far more powerful and more effective than 3x or 4x BB.
For the topic, use berserker stance carefully on first and last phase. Do not stay in berserker stance in p3 when there is no wind. On p2 and 3, always save your berserker rage for aoe. Ball lightning spawntime is 45 sec on p2 and 30sec on p3. Always use zerger rage and keep yourself enraged on whole aoe duration. Always use zerger rage before bladestorm.
This is tonights log of mine, current rank#1 at 25m hc:
http://www.worldoflogs.com/reports/r...?s=1273&e=1925