Does it rotate while drawing the bow? If so maybe you just need to put a twist or two in the string to help stabilize it. If it's not rotating but just out of position then maybe you only need to put a half twist or so in it.

If you have a good string you should be able to set it so it faces stright back and it should stay that way the whole way through the draw cycle. Of course you have to play with it to get it stright in the first place.