I will totally agree with DoninVa on this one.........you've got a great release and an awesome bow. Unfortunately, the zebra strings on the 03 LX's are absolute junk. Mine stretched for 3 months and finally I gave in and replaced it with a winners choice string.
You won't have any problems with the string loop moving if it properly installed bya pro shop. Once the string is good and settled in I usually put a drop of super glue on each knot to ensure that the loop does not twist side to side.
A note for the Mathews fans and Outback owners. So far my string on my new Outback seems to be ten times better than the string on my LX. I've shot approximately 300 arrows from it and it only stretched about an 1/8". My pro shop told me that it was a Tiger string, not a Zebra string and that it is a much better string. I know that both are made by Mathews and will be keeping a watchful eye on it.