I have been playing with the rdx 500 and love the way that the raquet plays but it has been killing my arm. My brother has quite a few 6.0 85's and prestige classic 600 mid's sitting around and tried them out today. My arm had no pain today after playing. My shot were 10 times bettter, and I could stretch out and really hit my power shots. My weak point was the serve. It was still very quick but it lacked a little pace due to the smaller head. I love the weight. Should I try a new rds 001mid and lead tape it up? Should I stick with the 85 and see if my serves kick better when I get used to it?