I have a Head Classic Mid, (93 sq in) and recently i have put 4 pieces of lead at 3 and 9, and then another 2 to balance it inside the grip. But I find that it's hard to hit topsin. I played a couple sets, and I was getting the hang of it, the last set I played perfectly, only one proble, and that's the balls are flying very low, much lower than what I used to hit. With my old racquet, I could hit the ball well over the net, but not so much with this one. Any tips on making it more spin friendly, without sacrificing the power?