I think the three biggest things I'd want you to take away from my suggestions are:
1. If you can figure out a way to 2 heal the fight without dying in phase 1, do it. Disc Priests are great for this, but I realize your Disc Priest is actually MS Shadow, which makes it a bit more complicated. It will take excellent tank coordination to make 2 healing P1 with a MW Monk + RDruid feasible, you have to reveal as many adds as possible and minimize the amount of burst damage players take.
2. Use Bloodlust in P2 and try to get Suen as low as possible. If you can get Suen low enough to where you only have to survive 1-2 Tidal Forces before Suen is dead in P3, it'll make the kill a lot easier to pull off.
3. You really, really need to figure out why you're having threat issues with your Prot Paladin. Having a tank die to threat issues in P2 is just awful. Either use Hand of Salvation or just stop hitting the boss for a few seconds when you're trying to drop threat.
Edit: If you really wanted to, after your Prot Paladin taunts in P2 use Heart of the Wild Tranquility. No way you're going to pull threat back if you're doing that :P