I hit a curved shot a lot more with my slice backhand it just seems easier to carve into the ball that way with slice. But with topspin, you need to make sure you come around the outside of the ball more. It is tough and probably not a shot you will use often at all. It just takes some side spin on top of that topspin. I have played guys who were good at those with their passing shots. Ball goes around me and finds a way into the court. Drives me nutz.