Yes, I find that PT always focused on strengthening, almost like they did not want to work, to do any stretches where they have to work to assist you. They just wanted me to keep doing strengthening exercises while they did something else...like eat pizza, or sign their mortgage papers (not kidding). It is so hard to find a good PT. But the assisted stretching exercises seemed to help the most. I think it's called passive range of motion? Where the PT moves your arms around and stretches them? That's the best for me, the few times I've been lucky and a PT did it.

Those pictures you posted are pretty interesting. I have a half foam roller. I don't have a rubber exercise ball to lay back on, but I do have an exercise bench, and I can lay on that and let my arms hang down to the side. Do you think it's worth buying one of those big rubber exercise balls to lay on?

I tried chiropractic at a chiropractic teaching college for almost a full year, all of 2013, and it did nothing for me.