In the before times, I was doing olympic weightlifting as well, and I had very similar problems. I've always had weirdly loose shoulder joints (and can partial

In the before times, I was doing olympic weightlifting as well, and I had very similar problems. I've always had weirdly loose shoulder joints (and can partially dislocate them), as well as weird things with the tendons in my knuckles. And when I started lifting, I would always have trouble with the jerk. Any time I did heavy jerks frequently, I would get escalating shoulder pain. As I trained more, I got better at maintaining shoulder stability. Power jerks still give me a lot of trouble, but split jerks are fine. Though with the pandemic, I haven't trained in months, and my shoulders are feeling all wonky again. On a similar note, squatting was the absolute best thing for my knees. I had knee pain since I was about ten, and it didn't let up until I started squatting heavy. And whenever I would stop for a couple weeks, the pain would come back.