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In my experience this primarily only happens when you send them to attack a mob that is moving. my only solutions are as follows.
1. have ur dk death grip to start the pull, and only do ur IWT bind after your tank pulls
2. have a bind for step back on all, and after the pull do that then ur IWT bind
3. spam ur iwt bind, it will sometimes make them run in circles around the mob
4. after pull, hit follow then IWT
Like i mentioned before, it seems this happens the most to me when the mob is in motion when i send them in, or in pvp situations, but them running in circles in pvp isn't all that bad of a thing.
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you can probably get away in PVE without using IWT on slaves. just follow and attack.
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I have /jamba-follow master melee tacked on to my pull macro, so when I throw AS or Hand of Reckoning, only my melee slaves run up to follow me. My IWT key is left as a separate keybind, which I only hit a few times when I get a new target to make sure they are facing the right way and in range. I get runoffs every now and then if I get nailed with a random lag spike or if I get overzealous with my tab key {IWT}, but it's rarely a problem.