I think Fiona has really good advice about taking a break and turning it off and then gradually going up slowly from there. Do you leave it on all the time? Sometimes maybe your body would benefit from short breaks from it.

Also, and I don't know what your expectations are for your pain relief, but the SCS works only for nerve pain, so it wouldn't help with arthritis pain, unfortunately.

I know how hard this must be for you going through a big surgery and then not having good results Hopefully something can be figured out with your doctor and rep to give you more relief than what you're getting now.