If you don't want to "live with it" are you willing to try a couple more things that others have found helpful for hard-to-resolve issues?

I had unexplained stiffness in my legs after repeated total hip replacements and revisions. I did all the therapy, for many months, but couldn't quite get the total motion I expected.

Acupuncture plus my PT finally did the trick. I can't explain why it helped but it did.

Others here have used MFR myocardial release, to good effect.

Finally, when I had intractable pain in my spine and most of my body, I saw a PT who focused on each impingement used manipulation and MFR to release it, and designed a specific stretch or exercise for that area. I still do them once most days to maintain, or more often when in pain.

None of these is easy to find, and usually requires continued effort over time by you , with periodic "tune ups" by the practitioner. It's worth it for me to keep moving, chasing young grands, traveling and dancing.
Sue