Been ripping my rubber stopper apart on my SOS. Got the bow in March and I'm on my third one. tried everything from a quarter inch off the string, more than that and right on the string. the only thing that seems to help is that I have put a small piece of foam behind the rubber to keep it from over stretching the rubber. The only problem now is that i have noticeable string noise. any one else got any suggestions or remedies?