The problem is most likely not your throw at all. Are you using the string that came with it? Because they are usually way, way too short. I really wish Duncan would fix this because it might make more non-top spinners than top spinners. Anyways, the string should be at least 5’ long (60 inches). I prefer 64" and other players like it even longer. You can order string from Spintastics (it’s really good string) or go to the hardware store and try to find something similar in thickness. Stick with cotton.