Quote Originally Posted by ny biker View Post
Maybe this thread will help.

http://forums.teamestrogen.com/showthread.php?t=52906

Also I am totally guessing here, but I'm wondering if you might need to change your riding position a bit. You might be leaning forward by bending mid-back, rather than bending from the hips. When you hinge at the hips, it shifts the weight forward and lifts the back of your butt. Of course that can sometimes lead to different saddle issues, but it's worth considering.

Good luck.
Another thing worth trying is start working on unweighted squats, in order to improve your hip flexibility. Here's a good video on proper form and depth. https://www.youtube.com/watch?v=xDdSZmWNYQI
I am fairly new to cycling, but on my group rides I can out-coast anyone because I can flex my hips to get my back flat to the bike instead of rounding my back. It also helps prevent a sore butt from riding with too much weight on your sit bones rather than the muscles farther forward.