I used to box Frost DK + 4 Ret Pallys. IWT is great, but I always had the "problem" of my toons running in circles around the target when spamming it. "Problem" because if your target is trying to use directional spells/attacks against you, then circling them like that can break LOS quite easily.

What I ended up doing was only using IWT if my main toon was dead. Since I had my 4 pallys follow strobing on the DK, and the DK was speced into Chilblains and other slowing attacks, I would position the DK on the far side of the target and turn around. This put the target between the DK and the Pallys. Since the target was slowed, I would move the DK backwards, side to side, etc. to keep my target between us.

One thing that used to be really fun with that setup was to hit the target at range with something that would proc Chilblains, Grip them to me, and move forward slightly while they were in mid air. They would land in between me and the Pallys, and I'd press my Go-To button. That was usually Frost Strike for the DK and 4x Crusader or Divine Storm on the Pallys. Good times...

YMMV