Just another T-15 end of life story?

I guess it had to happen eventually... it seems like Hayward T-15 is dying. Unit states "Low Salt", but when checked via 1766 testing shows 4600ppm. Shame on me for just adding bags of salt without recognizing a problem immediately. I replaced my cartridges (unrelated, it was time after 5yrs) today and cleaned SWG as well. No change. Diagnostic on positive side shows 1000-1500ppm, but negative side is 2800ppm. My FC looks good still, but I'm concerned that SWG may not run when needed. So I changed it to a T-9 in settings, increased operating % and now its 4100ppm. With the 500ppm Hayward tolerance, I think I may get a little more out of this cell operating as a T-9.... its a little over 5 years old. Installed with new pool in July 2018.

Any feedback or suggestions why I should not go in this direction, please let me know.
Thanks!