I have a good spin/kick serve. However i noticed that whenever i tried to put in more speed on the ball , the opponent was able to return it easily. When i put in with a 3/4 pace it was very effective and the opponents were hitting it long or netting it or even better missing it altogether. is it because.... 1) i still need to develop more pace. The current highest pace iam coming up is just ideal for opponents hitting it back. Once i get more pace i will be fine. 2) With a slow serve, the opponet has to apply more force/power and etc and that is forcing them to make unforced errors. This will work with lower ranked players but once i move up,slow servers are sitters. 3) I need to develop more pace and also better placement. can some1 help me out?