As someone who did PS, C+ and C- TATL during the last weeks i would not spend an extra $ for PE over C+. This es especially true right now with planes still relatively empty. If you can get an duo seat in C+ for yourself you will have more comfort then in a PE seat because of the fixed armrest in PE.
Absolutely no difference in service for someone paying + $ 1000 over the guy flying on an basic economy fare. I still have some memories from "back then" when we had hot tissues/towels in Y, an extra drink and nuts service before the dinner ( which had about 50% more food as the ones served right now ), a ice cream snack in between....but then maybe i's just my age.