What are the circumstances of the ball breaks from the magazine? I have shot thousands of regular paintballs through the magazine and have only had barrel breaks in the production version (bad paint). There is a small chance that the magazine you are using has a molding error that can cause drag on the bumper that follows the paintball. I haven't seen this since we went to full blown production though. Try putting some lube on the bumper arms.
And FYI the magazine loads faster then a Rotor.
R&D Engineer at DYE Precision Inc. USA