For those still struggling with a tiny Reverb G2 sweet spot, please try the following combination:
nvidia 457.30 driver
OpenXR custom render scale disabled
OpenXR motion reprojection disabled
MSFS render scale set to 100
I know this requires a beefy PC, but much to my amazement the driver/software appears to be affecting the sweet spot. I struggled with a small sweet spot before like so many others but now with these settings, the entire G1000 within the C172 is remarkably clear.
There is a new thread discussing this phenomenon here:
Reverb G2 Sweet Spot Discovery - Virtual Reality (VR) / General - Microsoft Flight Simulator Forums
Please give it a try and share your experience.