Quote Originally Posted by zoom-zoom View Post
Have you tried Pearl Izumi? I have this exact issue and they are the only brand that has really worked for me. I had several different brands of shorts where the widest part of the chamois fell behind my sit bones and my sit bones ended up on the seams in front of the butt part of the chamois. The only other brand that fit me OK was Gore, but the padding was not dense/thick enough under my sit bones.

Personally, the PI 3D Elite chamois works well for me, though they are a trifle thick - but do very well for long rides for me. So far I've yet to find another that does. Am currently trying Terry Liberty shorts for short rides, but for some reason it almost feels like I slide around the saddle more than I should with them I would not use them for a long ride, but outside of the sliding thing they seem fine for short rides.