@dazzla :
I didn’t try Fallout 4, but when you use VorpX, you change resolution in game (or in .ini/.cfg game files).
You must usually change FOV too.
Most headset (Quest 3, Reverb G2) have a 4:3 resolution. So choose a resolution like 2880×2160 at least or 3840×2880 if your PC can handle it.
You must set a high FOV too (try 120 for example) to use full VR.
That’s what a native game would do. You just have to do it yourself if needed.
In Full VR, you should unzoom to the border of your view. It will be blurry if you zoom into the image.
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If you can’t change the game resolution, maybe you should check “Don’t optimize game settings” in VorpX config.
Use VorpX Beta and virtual monitor to have any resolution you need, even if your monitor doesn’t handle it.
Last thing : games with detailed textures will be better, because you see every detail in VR…