Thanks for the thorough follow-up!
With a smooth locomotion pawn you’ll get a much better feel for the collisions. (Adding a non-vr pawn and navigating the level was going to be my next suggestion if you were still having troubles, so it’s cool to see that’s what you did)
I think that enabling ‘use complex collision as simple’ would overwrite the ‘simple’ collision mesh generated by 10DOP-X generation. Since things are low-poly you could probably use complex as simple for everything. (Although it looks like simple collision will still be used in nav-mesh generation)
Snap-turning helps me the most with motion sickness.