Make sure you buy the right size. For a long time, I bought a certain size because I hated the idea of feeling constricted, but I had the same problem as you. After reading posts here, I finally went out and bought a pair one size down and I was amazed at what a difference it made. No more chamois shifting around and bunching in my groins. And the smaller size wasn't anywhere near as constricting as I expected it to be.