There are also muscle based factors.. hypertrophy /over developed muscles can crowd all the structures and cause a mix of symptoms..
If neck/shoulder muscles are large, maybe a factor?

Past surgeries can cause internal scarring unfortunately...
I'd suggest another career path if having increasing issues from the training time required for a professional..

You can google about past ballplayers & injuries and how they did not last very long at a high level after surgeries..

Low level laser (aka cold/soft) helped for my pain areas..
Inferential stim
Far infra red
those can also work on a cellular level for healing..
links to info on those in useful sticky thread - or web search them..
https://www.neurotalk.org/thoracic-o...les-polls.html