dphatt As someone who has battled back and neck issues over the last couple of years, I can empathize. It sucks getting old and minor back pain that doesn't necessarily prevent you from playing but just makes everything a little off is so frustrating.
As DaHOF said, those scores with a bad back are solid.
My advice would be to shut it down for a bit, get with a good massage therapist who does cupping, drink a lot of water, and figure out which stretches and exercises hit the areas you need to strengthen.
I'm literally doing all of those things right now (along with seeing a podiatrist for a likely stress fracture in my foot).