Glad you're doing better Coop.
Fascia plays a huge role (for me at least). I had bilat pec minor surgeries that didn't work and had TOS surgery on LT side --- 20-25% improvement. The TOS surgery helped with some things, but function was still a major problem. I have been doing myofascial release for about a year now and I get better ALL the time. I am now able to do a lot more.
What is scary is that the better I get at it, the more problems I find. I have been finding HUGE chunks of scar tissue between the muscle and skin (kind of like grabbing the fatty area above the muscle).
I told my PCP about the suspected scar tissue at a spot near my LT median elbow -- she didn't know what it was. Got an MRI and it showed something at the base of the fat tissue. I showed it to the radiologist at work and he didn't say anything about it until I pointed it out. When I showed it to him, he said it wasn't normal, but it was "non specific" (which means he doesn't know what it is, but according to his training, it shouldn't cause any problems).

That lump is scar tissue and I squeeze them and crunch them up almost everyday --- there are so many of them. Every time I find one and crunch it up, my TOS/functionality/and ROM improves.
Just wanted to share b/c I know how much TOS sucks -- it stole 10 years of my life --- I lost my house and my career. However, I have since retrained into a new career and things are much better.
I wish everyone the best.