@mrhappy I had issues with glute trigger points and whole chains of trigger points from lower back to tight IT bands down quads and tight hamstrings. Found a therapist that used ultrasound while stretching which helped me a lot (that is not a “standard” treatment. That was a self pay situation but within 2-3 1 hour sessions I saw a big difference. Way less stiffness. Some chiropractors use electrical stimulation which also can help, too. Some say gentle movements help (like flowing like tai chi, etc.). Also, try spiked massage balls not just flat ones. There is a curved roller called a Rollga (available in soft and pro and other models). The curves allow you to work in the grooves and also go right up along the spine, too. I would guess some spinal nerve compression issues are driving this. Perhaps the Rollga might really help as it might massage along the spine. Rollga’s helped me a lot with glutes, IT bands, etc. Good luck.