yo. im currently using a Donnay X Blue. thats my new stick. its like 12somthin' oz.. pretty heavy.. but my question is would that affect my playing? i've had it for like a month and im just not as good with it as my Babolat AeroStom GT. but... i think that's due to the slightly smaller head frame and the strings. babolat-poly ~ donnay-synthetic. i like to add alot of topspin if i can. almost full western on my winning shots sometimes. i was doing okay for awhile, trying to get used to my new racquet with the strings, but until last week. my arm started to hurt. it felt like i was going to pull my bicep muscle (dont even know thats possible???). so apparently... my new racquet is more demanding, cause its like a oz heavier, plus i cnt add all the topspin i want. i only got this rest of the fall and winter to fix anything up before my last highschool season in the spring. my school plays a state level high school team in my conference, that has had some amazing players in the past. which they still do, and ive gottten to train with one of the trainers. time is of the essence, im at 2nd seed at my school, can be 1st if i can SIMPLY GET THE BALL IN. so my question is: why was my arm hurting? is it the heavy racquet, maybe my form(which i doubt it is), or maybe should i lift some weights so i can play according to how fast im swinging? and should i get some poly strings/or stings that offer me plenty topspin on my Donnay if i want more topspin?