^ That sounds extremely strange. Have you tried reinstalling the driver/runtime on PC?
About LFS DK2 patch: Just had a nearly three hour long non-stop session in the Rift, zero nausea.
I did notice one thing while driving open top cars though... the direction where the sounds originate from don't seem to use headtracking data. So if there's a car on your side and you turn your head to look at it, the sounds stay exactly the same as if you would've never moved your head. When using headphones, it's difficult to ignore once you notice it happening.
Elite Dangerous does VR sounds by asking Rift users if they're using headphones or speakers and using positional audio accordingly. It might be worth considering doing something like 3D positional
binaural audio support for LFS at some point, I would imagine it to have a noticeable effect for headphone users, especially when in VR.