I sort of think the opposite about moving your head. Even if the frame rate isn’t great I find moving my head to look makes me way way less sick then just staring forward and having the world move around me. But definitely I agree about not whipping your head around all fast crazy. That’s a sure fire way to instantly enter the sick zone.
When I first tried vorpX(and the Rift in general) I would get dizzy but I found adjusting my IPD(I was using factory Rift settings) and turning down the 3D in some games helped dramatically.
Also if your PC isn’t exactly a power house try having nothing else running and turn down the in game settings to see if you can bump up your frame rate.
I could only play for about an hour every other couple hours when I first got the Rift. Now I can flip around, dip dive dangle and it doesn’t bother me. Hopefully after time you can get used to it. It’s does sucks some people get sick even after trying to adjust to it.