Hi and thx for the inputs!
Got driver 20.4.2 installed at the moment and with it, my Epson projector is stuck with Pixel format YCbCr 4:4:4 . 
I checked the windows 10 color settings @ Desktop >> Display Settings >> advanced display settings >> display properties >> color management >> advanced
and the settings in there are both identical for my Dell display and the Epson projector, so no joy. 
This issue has been pretty much on and off with AMD drivers for years now, as I remember coming across this one with my older AMD GFX card years ago, but then too the issue got resolved by AMD drivers eventually. Sounds to me AMD needs to find a permanent resolution for this issue, but in the mean time I am staying with the 20.2.2 which is stuck at Color format Full RGB for my projector.
You can find ICC profiles in monitor database or create your ICC profiles setup
ICC profiles are used in order to match the color values of your display with a particular device such as your camera, printer, scanner, etc. In other words, an ICC profile is a LUT (Look-Up Table) with certain properties of a color gamut where a particular color will be displayed as the exact shade of it, not just any random tone of that color.
When doing color-critical work in software such as Photoshop, it’s imperative to have a calibrated display/printer as you would, naturally, want to see the same results on the print as they are on your monitor.
Additionally, these ICC profiles can increase color accuracy of your monitor as well, if you are able to find the optimal profile for your display.
Keep in mind that the ICC presets work best with the particular monitor/graphics card or printer combo since they are based on the individual’s computer setup. So, even if you have the same monitor as the user’s ICC profile, the results won’t be exactly the same. In fact, even the monitor manufacturers change the panels of their monitors over time.
Regardless, you could still get an enhanced picture quality with better colors and settings. If you happen not to like it, you can always restore the settings to default. It’s also advisable to apply the recommended OSD settings that you find at the ICC profile database or wherever you have downloaded the profile from.
For the most accurate settings, however, you will have to use a hardware calibration device, also known as a colorimeter, for your own display – which is how you create the ICC profile in the first place.
How To Install ICC Profiles?
In Microsoft Windows, after you download the .icc profile, you can simply right-click on it and select ‘Install Profile’. If you can’t add ICC profile that way – which can be the case if you have already installed a profile before and want to replace it, copy the profile to the following folder location where the ICC profiles are stored: C:Windowssystem32spooldriverscolor.
Next, open the Color Management from the Control Panel. Tick ‘Use my settings for this device’ option, and then ‘Add…’ the ICC profile. After that, go to the ‘Advanced’ tab where you will have to click on the “Change system defaults” first, and then you can tick the ‘Use Windows display calibration’ and as simple as that – that’s how to load ICC profile.
This method works for installing the ICC profiles for Windows Vista, 7, 8, and 10 while MAC OS X users can copy the profiles to: ‘/Library/Colorsync/Profiles’ or ‘~/Library/Colorsync/Profiles’ depending on whether the profile should apply to the entire system or just a certain user.
Other Alternatives
If you’re unsatisfied with the results, try manually fine-tuning your monitor calibration using Lagom test images.
There’s also a great and free ICC software called ‘DisplayProfile‘ which you can use to easily store many ICC presets and quickly swap between them.
