I had been having terrible trouble getting rF2 to run in VR on my system ! GRRR! I had been thinking how much work S397 have got in front of them if my 1080Ti system couldn't even run with Low settings but after a lot of stuffing around and with a lot of help from @ceecee and @Ari Antero figured out that one of my RAM sticks was dodgy . Whoda thought ! So after removing said Dimm and just running 8Gb of RAM i was able to have a 10 lapper around Old Monza with 23 (Enduro racers) Ai at 3am with near Max settings with next to now stutters and a very solid 90 FPS mostly . I even had a rap in the rain with the WFG Mclaren and 23 Ai at 1pm and also a smooth experience . So here it is SORRY for ever doubting you Studio 397 ! I'm back and in Love again .
Here's the thread where I was helped finding the issue. https://forum.studio-397.com/index.php?threads/starting-fresh.59313/page-3#post-935374 Have a read, it may help others I guess.