I suffer from vr sickness too, so far project cars, rip coil and alien isolation are no go's for me. Playing them for little bits every now and again to hopefully build up a tolerance but do you think it could be solved via graphic settings?
If your performance is good, graphics settings won't make a difference.
From what I can tell from reading a lot about the subject and some of my own experience there's two major reasons for "VR sickness" really, the first being a latency between moving your head and the image moving (solveable with good frame rates), the other being caused by particular kinds of movement. If the camera is moving but there is no other apparent movement or cause for that movement (such as would happen in say a drone shot), or you're rotating or moving with some kind of locomotion that's detached from what's going on in the experience such as moving or rotating with thumbsticks that can really cause a disconnect to what your body is experiencing and it can easily make you feel queasy or even ill.
Rip coil is definitely an iffy one, can't say it made me queasy but it felt very weird. Alien Isolation I haven't tried yet, but I presume the locomotion would be similar to that of Minecraft in "immersive mode" and that locomotion made me queasy initially, but it only took me a week to gain VR legs. However, both these two titles have less than perfect locomotion if you haven't got your VR legs just yet.
I'm surprised Project Cars is causing you issues. Probably best to get started purely on the "comfortable" experiences where you can sit or stand and do not otherwise move around, not even in a cockpit, rather than trying the less comfortable ones and just making yourself feel bad. Try Medium, Quill, Superhot, Fantastic Contraption, Toybox, The Lab, to name a few. Lone Echo / Echo Arena could be okay too (since your body "knows" that when you push or pull yourself with your hands you should be moving like you do) but I'm not yet convinced everyone will have an easy time with these two titles. And when you feel any queasyness or illness, stop immediately: go to the pause screen, close your eyes, take a few deep breaths, take the headset off. Then do not use it again until you've fully recovered. It may take some time, but you must not force it.
