I was having the same problem. Planes with screens were off limits. What helped me was using the SteamVR Linux Beta instead of the standard Beta. I flew the 172 last night for a few hours and it was like night and day. I wouldn’t say it was perfect all the time, but it was unplayable before.
I also followed the guide from this post to help dial in my initial settings:
I’m running 3900x / 2080 ti / 32GB @ 3600
Edit: I also had to use Low for Volumetric clouds. My PC was begging me to stop on Medium whenever I got close to a cloud.