I have same your pc spec .
I’m running all high-full setting expect for
Shadows-medium
Opponents cars-medium
Reflections-medium
I have AA-3
SS-1.7
PP-off( personally I don’t notice any difference between PP of and ON in the visual part).
In Studio397 tracks I have no problems at all running stable 80fps . Only on the start with 13 visible AI it drops to 55-60 FPS but after some corner it returns to stable 80fps.
I noticed that all tracks from Reiza tracks are perfectly optimized for VR..
The only track of Studio397 where I have issues are both Nürburgring Nordschleife and GP... they need a lot of optimization for VR.
With third party tracks.. most of them are bad with VR.
lol in some of them even setting every thing on low and running private sessions I can’t go over 40fps