Thanks for the help - I FINALLY got it working. I'm not sure why, but I needed to do the OpenXR step in order to use --force_steam_VR and have OpenVR off in Varjo Base. I now have a stable framerate and a single cursor!
I briefly tried the eye settings you asked for (now that I have a functioning Aero) and it made it my head hurt - I had to revert it.