I have been wondering if there is a connection between weight and TOS, too. It would make sense to me that muscle bulk on the upper extremities might be a contributing factor to TOS, but I wonder if excess lbs could play a role.

I'm 5'1", about 105 lbs, so I don't have too much weight to lose, but I am curious on the issue.

According to this Mayo Clinic website, losing weight can relieve pressure on your shoulders muscles. According to the the American Academy of Orthopeodic Surgeons website, extra pounds can stress the muscles that support one's collarbone.