As the others have mentioned, there could be several factors to blame. Indeed it could be a drwlength that is to long but it just as easily could be that your torquing the grip inward with your rest of forgetting to unlock your elbow while at full draw. The best place to answer these questions would be to head to your nearest Pro Shop so they ca actually see you shoot and make sure you're set-up correctly. Good luck and good shootin'