Just to update;
I've run the P935 on bottom only mode and it works fine. It just stops climbing about 10 inches below the waterline and them continues. So, I'll just keep running it that way. I still brush my pool by hand once a week anyway just to be clean crazy.

Never did get through to Polaris tech support. I'm guessing they're swamped with others like me???

Happy Summer,
Splash