My last three pairs of bib shorts have all worn out in exactly the same place (see picture). The latest pair started wearing after about 5 rides. I average about 100 miles a week. Do you think my position is off? I feel like my sit bones are in the right place on the saddle when I'm riding and I don't have any discomfort. I've had a bike fit. The shorts are all high quality (at least expensive) Specialized and Pearl Izumi.
Here is a picture of the saddle and the clamp from above. I'm holding a level to show how the clamp extends past the saddle. I think that is what is causing the wear.