This is a very interesting topic. As you know this problem has three phases, pain, decreased range of motion and regaining ROM. When I got it a few years back, I went to PT and was very gung ho about doing the exercises/stretches religiously and started to show some increased range of motion rather early in the process. I was very happy about it, but later noted no further benefit from PT.
Much later in talking with a PT in another context, they mentioned that in their opinion, this problem runs it's course over a number of years whether the person did the PT or not. I stopped doing any specific exercises/stretches. I have slowly (very slowly) improved and since it is in my nondominant side, it has no impact on my game whatsoever (never did).