Definatly change one of your shamans to resto, i did and ive never looked back. The resto shaman can heal non stop while the others dps and i never run oom before the fight is done, Heroic strat was the first heroic ive completed and is now trivial to me. I couldnt see me doing all the other heroics ive done besides HoT, Hos and oculus is the only ones i havent completed, without one of my shamans being resto. its the best move youll ever make, Why stop dps to heal on 4 when you can keep dps on 3 and healing on one!!