I just got back from a tournament and after i was done i noticed that my shoulder forearm and wrist were all hurting and i have read all the info on the cupping to see which i can but i seem to get a little tired with a 16 and i leave a lot of back row pins. With 15# though i seem to have trouble keeping the ball slower and wan to try to zing it and didn't know if this was something that might go away iver time if i kept using them