I have the same pain. Normally i shoot right handed, but went left handed a couple of years back to allow a finger joint to heal. Now my right hand first joint of my middle finger flared up, who knew that the official red neck salute could do that. Anyway, shooting left handed again mostly I got into target shooting bare bow with a fine recurve. I use a bit more of an upright stance with a greater stretch, straight arm and something totally wrong with my bow shoulder and have the same pain. I have a good chiropractor that found the hot spot and I am getting better, but I have to shoot longbow style with the shoulder blade in more of a neutral position.