I've had some lower back and leg pain (actually more of a severe discomfort) that a physical therapist diagnosed as a shortening of the hip muscles, specifically the piriformis muscle. Online search indicates that the cause could be poor walking or running technique or poor body mechanics related to a normal gait. The PT asked me if I had changed the way I do anything over the past 3-4 years since he felt this was a long term slow change resulting in the problem. The only thing I could think of was the fact that I started carrying pretty much fulltime about that long ago. Mainly I carry a M&P 9C with CT grips in a Don Hume OWB holster at about 3 o'clock. Weight is about 31 oz fully loaded. Has anyone experienced anything similar?