I'm not sure I understand what you mean by rubbing on the backside of the saddle. Do you mean that you are sliding around and therefore moving too much? Is an edge of the saddle rubbing on your leg?

Here are some things that I have found and/or remedied with this saddle and have adjusted. I've had this saddle for a year and it's working out pretty well for me.

1. At first, I had some rubbing on my left inner thigh, caused by the edge of the material. I took a file and filed it smoother and rounded it off (when I knew I was going to keep it). That and the right saddle position.

2. At first I didn't feel like I had a platform for power output, or rather didn't feel like I was getting maximum power with each pedal stroke. I had to tension it quite a bit to feel that there wasn't so much give, as some of the power output was going into the saddle as opposed to foot-pedal-forward motion. I had it so it was still cushy; it absorbed road impact and didn't bruise the sitbones like other saddles. (Alot of my pavement here is bad). Once I tensioned it, my mph actually went up a bit, but that could be because it also was the most comfortable that I'd been on a saddle.

3. Once I tensioned it, I did kind of slide around. Shorts that weren't slippery also helped keep me in place. I had gotten a fit done by John Allis at Belmont Wheelworks, a former racer in the 60's. He recommended tilting that kind of saddle up a little because you don't slide around or down into the hammock. He said when he raced on leather saddles he always used to tilt them up big time to keep him in one spot.

Obviously, too much tilting puts pressure up front so there is a balance.

4. I had to go to shorts with thinner chamois with this saddle.