As I said above I have had three lower back surgeries, back feels fine now however I played golf yesterday, 45* and ~15 MPH winds. I took Alever, (440 mg) before playing, made sure I stretched out, felt good. By the time I got to the 13th or 14th hole I felt it in my lower back, not nerve pain, more like muscle pain. I did not get any better by the 18th, maybe I should have stopped after the 16th but.... Today back is tight and hurts. I guess I will be living with this for the rest of my golfing life. I'm thinking the cold didn't help, plus we were bundled up with clothes. But it doesn't get this bad during the summer time.
I shoot mid 90s, sometimes high 80s but not often. I have used every ball out there and have found little difference at my level. I know a lot of people will tell us that the ball is critical but for me, not so much. I also hit the Costco Callaway and or KIrkland balls, they work fine for me.
The only real difference that I ever notice is how they feel on putts and chips. If you can play a ball around the green and it isnt ripped to shreds then I think it's fine.
I think that premium balls are more of a luxury item than a necessity. I buy the bulk online premium stuff usually. This year I went Snell (need to update my signature) and it was something like 140 for 60 balls. To me that is worth it to have a top end ball even if it doesn't make any difference to my game.