This is sort of a follow-up to another thread here but I didn't want to barge in on his post. I've been playing for about 2 yrs. now and I can't remember the last time I felt discomfort in my arm or shoulder. I've taken a lot of lessons, as recently as last month actually, and according to the instructor I have very good form on my strokes. But lately I've been experimenting with different racquets, and also experimenting by adding lead, and I've begun to feel pain in my shoulder and symptoms of tennis elbow! Could it be from so much switching of racquets and weight? Here are some of the racquets I've been hitting with: Tour Diablo MP Pure Storm Team Pure Storm Tour APD I'm a 3.5 player who takes full, fast and loopy swings. Any opinions are greatly appreciated. Thanks.