I've read that MRIs apparently show more soft tissue than a CT scan does, so if that is the case it does seem the better choice if it should be necessary. I decided to return to the awesome PT I saw for my hamstring and quad tear in my first year of riding. His office is FAR out of my way, but he typically is able to get results and people out of PT quicker than usual. He has multiple certifications, including McKenzie, so he has a large toolbox and lots of experience from which to draw. If anyone can get that shoulder to respond though PT alone it will be him.