Hi Tom , I underwent extensive chiro mainly ( as you interpret ) on my Sacro illiac joint , but again on my return to heavy lifting ( squatting to depth OR a testing deadlift ) the pain would return , perhaps I was too eager & it was too soon.
Ultimately I gave up pursuing getting back to competitive lifting and instead simply avoided any exercise that brought about my pain ( namely the powerlifts ) and simply concentrated on what I COULD do instead of what I COULDNT.
To-date though I am pain free and really intent on giving competing another go , IF ( god willing ) I can get through the preliminary stage of performing the 3 lifts proper.
I am now older and wiser , & hopefully through a properly executed rehab programme of strengthening and also specific stretches I can/will see myself back there.
Best wishes , T.