I'm having trouble finding a balance between brushing the ball up and hitting through it on a topspin serve. Usually, it's one or the other and I double fault. If I brush up too much, the ball doesn't go past the net, and if I hit through the ball too much, it goes over the service line. Any help please? Edit: I finally have a video of my topspin serves. http://www.youtube.com/watch?v=5rK_OX96YTI Uh yeah, I don't know...I haven't been able to generate spin on any part of my game lately. Please help.