Thanks for all the help. To update:
I took a week or so off and only played 9 games of 9B total in that week. The leg/hip/back issue seems to have fixed itself with rest. I'm still taking it a bit easy so as to not overdo it. I think an issue I was having was with the pain I couldn't get into stance properly and it was hurting the problem even more.
The week off seemed to have helped my game. I'm playing better and thinking less. I'm limiting the extremes on the cue ball. Trying to do the minimum to get shape and maybe a bit less at times. My shape and position play has improved greatly by just taking it easy on the cue ball. I would have been lucky to run 6 balls regularly before and choke on the last few. Now I'm staying in shape and ran 8 balls a few times. I got two pieces of advice this last week, finding the extreme, then cutting it down until it's a certainty the ball is made. The other was an observer noticed I wasn't following through on many shots. As soon as I heard it I realized it was correct. Apparently I somehow got off track and was just stopping the cue at impact. Might have been to limit motion due to the pain, or just being a dumb dumb. I'm not sure which, but those two tips have got me playing much better.
While off I also played "shooters pool" a little bit just to study position better. I was also closely watching my friends play some high level 9B. We've also went back to playing some 1P throughout the night which has helped me with feel and tight situations as well as cross banks and such.
Thanks again for the advice!