Which loop???? I mean, you say you' ve been shooting it for 2 years. In two years I would have changed strings 4 times and cables twice and gone through about at least 4 loops. If you haven' t changed a string you' re past due and living on borrowed time. As far as the original question, if installed correctly and you' re pulling back at a near square to the string line it shouldn' t move except for string stetch etc.... which is why you shouldn' t really worry about perfection until you get a 150-200 arrows down range.