For those wanting better HDR calibration in windows 11 microsoft have a new app available on there store.
It creates a new colour profile for your monitor after you have ran through the calibration setup and it seems to have improved things for me.
Windows HDR Calibration - Free download and install on Windows | Microsoft Store
This app lets you calibrate your HDR display to optimize it for HDR games (including Auto HDR) and other HDR content on your Windows 11 PC. Go through a series of steps to set the minimum and maximum brightness levels, as well as color saturation level, to create a new color profile that's made...
apps.microsoft.com
It creates a new colour profile for your monitor after you have ran through the calibration setup and it seems to have improved things for me.