hi! i have been using pro staff 6.1 classic for a long time. then i switch with the hyper pro staff 6.1 & used it for at least 2 yrs. but for some reason i keep on going back to the classic because of the feel. i stop playing for a while because of sickness. now that i am back, i notice that my arm starts to bother me, specially my shoulder and i think if i will keep on going with this racquet, i will further hurt myself. do you guys think that i need to switch to a new racquet or i just need conditioning and lifting weights. i am a 4.0- 4.5ish & try to consider that i am no longer on my teens. i am short about 5'5" and 138lbs. if you recommend a new racquet, what would it be?