Could you try switching to Singular for a test run? Tuanha apparently performed really poorly with DK on this profile
The profile does not seem to like it when I use Tuan's CC for Prot Warrior. I get into the second room each time, then after the hallway (with the Pat) it targets a mob and just sits there.
I'm going to try this out on my Ret Pally, if he's too weak (ilvl is only 676), I will switch over to Prot and post an update.