FWIW, I have managed a decent VR experience on my gtx 1070.
A few steps were essentials :
-RiftS was sold for a Quest2 , not a performance issue but an IPD one, believe me, software IPD adjustement is worthless.
-Installation of VR moded shaders as available on this forum,
-Running Oculus Tray Tool, ASW locked on 30Hz, Quest link set on GTX1070 preset template
I wish I had a better definition or pixel density, but at least everything is running smooth now, I can fly low altitude (F/A-18C) over cities or forest, and turning my head on the side of the cockpit without chopiness.
Hope this helps.