hi. I am sorry to hear that you have SI joint pains.
I used to have that for 10 years after almost all professions fail to diagnose correctly. As I did research treatment on myself,
I found those of things are possible cause of my body.



Unstable SI joints are due to
1)ligament damgage(posterior long dorsal, etc)
2)compensation for muscle and fascia dysfunctions close to joints(attached to illium and sacrum)
3) misalighment of upper cervical
4) compensation from knee instability
5) compensation from altered function of ankle(less dorsiflextion)

SI joint instability sometime is not an issue of its joint. rather than compensation from other structures.
I am guessing all treatments are done for 2), and maybe 3) and 4) and 5). if not receive proper treatments.
for muscles and fascia, active release technique type works well. but you need to have a good provider. The best one and average one's difference in terms of diagnosis and treatments are like distance between california and newyork. Skill really varies. For manipulations, diagnosis and treatments vary.
Good one can achieve long terms result and bad one can last only 25min. for maintenance of your joints movements, i recommend Gyrotonics.



Treating 1) case can be done Blocking procedure in spine position. so sacrum can become closer to iliam.
When it comes to SI join stability caused by 1), any treatments(exercise, stretch, manipulation) will fail and result in only relief for temporary 25min- day.
When i started to treat myself with blocking for 4-6 weeks,
my SI joint becomes stabilize along with Gluteus medius stretching and strengthning)
When receiving blocking correction, you should not receive a manipulation or excessive load exercises on joints. you have to let ligaments heal or you will not ever get fixed.
if you have instability and also fixation of si joint because of surrounding muscles(fascia) are dysfunction, you need to treat those muscles(fascia), or receive really light manipulation done by instrument such as activator for temporary pain relief.
I wouldnt recommend to use blocking by yourself because you can hurt yourself if done improperly on wrong side or done too much.
Blocking specialists are called SOT practitioners in chiropractic worlds.
There is always good and bad in any manual medicine practitioners, and i highly recommend to do research to find the best provider possible.
I hope you the best

sincerely