Hi there, i was wondering if there are any suggestions for a less stiff pure drive?? as my arm has been experience some tenderness for the last few days. i like to stay with that kind of racket, as i currently use the pure drive roddick. i like something with that kind of power and serving bombs! i already tried switching strings from full rpm at 57 to rpm 18 at 50 and sensation 52 to gamma syn gut at 57. Yet my arm still experience some tenderness Thanks for your suggestions!