Do you actually understand how difficult it is to calibrate HDR? I came to this point when my HDR calibration was going nowhere because of the limitations of the Vero & Kodi.
The lack of spectacular highlights are obvious on many HDR content so, yes, it is more than staring at test patterns. Please don’t patronise me. I am just trying to help OSMC here. I own 2 Vero 4K+'s
My SDR is fully calibrated and it makes a huge difference.
I have ordered an Odroid N2 because that does respect HDR metadata and about to order an M9702 Oppo based streamer because, yes, I do expect my high end TV to get fed the highest quality source.
Please educate yourself here :4K HDR10 - State of Play thread - important media player limitations.
I didn’t spend 1000’s on software and meters to be silly.
Edit : For HDR calibration, one should never touch Brightness or Contrast as the display uses the default settings for tone mapping. So I haven’t even got off base and progressed to GrayScale/CMS because of the metadata issue. NB, for Samsung QLED, one should adjust Contrast to match the reference EOTF & Luminance curve as Samsung deliberately make the pic too bright. That I have done (caveat using the Vero so I need to double check using the Samsung player).