since all of my strings were broken on my pure drive +, i decided to try out a number of different racquets. i tried various dunlops (aerogels i think) and some of the different kfactors, but every single one i tried caused me arm pains... definitely nothing i felt while using my pure drives. is it possible my arm adapted to the pure drive or something? i didn't ever understand why that was the only racquet that wouldn't give me pain. has this happened to anyone else?