We're in pretty much exactly the same position (on 25man HC) but we just need a few more attempts practice to get it down. I have wildly optimistic hopes for tonight...
Heh, it's only 10man normal for us

Which tactic did you go with in the end? We're disabling Static Shock and Diffusion Chain to have them active in P3 and using Mass Spell Reflect to dump more DPS back onto Lei Shen.
...which means I'll just gaze blankly at this statement.