>>720397496
It's not that bad to set up. I use Dylan Raga's gamma fix and then adjust the sliders ingame. Black level is almost always minimum, and white level is 1000nits, which is usually specified in the settings.
>>720397654
I think it's trying to push a brightness your monitor doesn't want to do (OLEDs tend to be dimmer than MiniLEDs to save the pixels from burning in). That 400nits max is what worries me. It's as if your media is calibrated to hit higher, and your display doesn't want to.
I'm not sure how GSync would factor in, though. Is that "enable GSync settings for the selected display" option selected for you? It usually works around some device-specific quirks.