Tried 1.09 on my setup: Quest 2 with link cable, RTX 3080.
The lag when you move your head is still there. I try to avoid it as much as I can because sometimes it's nausea inducing. The jitters when you are in the pits are still there, but it's being a lot better since 1.07 or 1.08 if I remember right, so apparently they did something to at least mitigate this issue.
I'm still experiencing Steam VR crashes after a couple of flashbacks. The VR image freezes when the game load the 2D screen to show you the replay when flashback is selected. If I don't do flashbacks, it seems the game don't crash. When it crashes, I have to close and restart the game AND Steam VR tough.
They had removed the weird legend in the monitor window when I put off the headset. Now I can use that screen to navigate the menus, make setup changes, etc. without needing to wear the headset. This seems to have solved the game crash I had when I wear off the headset for a while (when I go to have a coffe break for example)
I have found some settings combination which gives me good and solid frametimes for my system, with a very acceptable image quality, so when racing I have a really good experience (besides the head tracking lag I mentioned before).