The Radiance Pro CMS only does what it is told. If you have color issues after a calibration then the calibration is suspect. The only calibration software (at this point) that I would recommend as good enough to do a 3D LUT, especially for Rec 2020, is Lightspace. I know Portrait Displays has hired a Color Scientist to improve their 3D LUT Rec 2020 calibration. So I expect Calman will have a much improved 3D LUT capability at come point in the future. My attempts at 3D LUTs with Chromapure did not work out for me.
I'm a newbie, and my only concern at this point is that I finally invested in ChromaPure after looking at it and other options for years...and then I read this.
I had to send off my Radiance Pro for repair so it was a good opportunity to upgrade the input cards and do a calibration for the first time in years. And I decided to go this route considering what a moving target things seem to be.
Hoping this will work out over time...and the products can all be recommended for a 3D LUT by Jim.