After a year of messing with HDR I have decided that LED/OLED/LCD are just not up to it yet.
ATM you can't have a full HDR experience without white clipping, to get white levels at 100% you need to have contrast set to 70, for non crushed blacks you need brightness at 55. Welcome ugly dim, washed out image.
You have to compromise between white clipping/luminescence. I cannot wait to see this tech improve over the years. Almost changed to an LG B7 until I realised they have similar problems with crushing blacks and blown out whites.
I have used these settings for the last few months, I have altered them but always went back. You will get a little white clipping and a minimal amount of black crush, but that's the price you pay for the HDR effect, it still looks fantastic.. but the white level sits about 90ish%.
Movie Setting
Backlight 20
Brightness 42
Contrast 100
Sharpness 13
Colour 50
Smart LED High
Dynamic Contrast Medium
Colour Tone Warm 1
Gamma -2
Also make sure you set the in game HDR settings properly. I find this gets bright highlights, deep blacks, great colour. Yes you will sacrifice a little white detail, but unless you are studying every line in every cloud with it off and on, you won't notice. But the slight percentage loss is well worth it.
Anyway, it doesn't really matter. You best calibration tools are your eyes, do what looks best for you. Don't be afraid to play about with the settings, learn what does what.