Has anyone found any good exercises or stretches for SI / low back/gluteus maximus pain?

I have something in those areas that comes and goes and lots of under the skin stiffness or {fascia/myofascial} tightness.

I don't have any zaps or shooting pain down the leg- just more in the SI area and spreads into the butt cheek muscle.
more of a moderate discomfort then sometimes a moderate sharp pain and a low level throbbing.

chiro can fix it up, but it eventually keeps coming back after I do something to flare it up and it is bothersome for about a week or so.

I do have some hypermobility issues , I think this is part of the reason it keeps returning.