I’d suggest you have a look at Alex Vlachos videos I’ve posted near the end of this post:
My 2070 SUPER VR settings and suggestion (Reverb G2 - WMR)
It will explain things better!
TL;DR: because the VR driver must distort the image with barrel distortion to compensate for the lenses pincushion distortion, you have to render at a sufficient resolution so that the rendered image resolution as enough pixels at its center to fully represent each of the distorted image pixels. With the G2 resolution you shouldn’t notice much difference it you’re using a resolution a little bit lower than 100% (1.5x native res) but you might start noticing more aliasing artifacts at 50% (1.0x native res though).