I have like 2.1k sp before ToW, and 20k hp on each, and most bosses, i just zerged down fast. The encounter is designed for 3 dps, so when you run 5, overgeared dps, its like triple what its meant to be. Add in heroism and its just insane. I used elementals on certain bosses, that hit hard, but mostly, just zerged down, ocasionally stopped to mass chain heal to full.

Edit: oh, and i have dual spec pve and pvp, but i forgot to change it, so i was full PvP spec/gear, and i know i wasnt hit capped... it was really easy, especially considering you are only DPSing...