T spine if you have been using the same tools I’d try some different ones.
A lacrosse ball may be too hard so your tissue is relaxing. Have you used 2 YTU balls in a tote?
These work real well.
You may want to use a different sized ball.
Have you used a super friend at all?
Nothing wrong with steady improvement so areas are slower to release.
If you aren’t seeing improvements you want to relook at your approach. A quick run through may be missing parts. Instead of comparing against each other compare same segments to same segments.
Keep working with it until you stop seeing change.
When you stop seeing change its time to re access are there restrictions/limitations?