OK, so I’ve installed iPhone & aTV OSs 14.5 and tried out the color calibration feature on my 55" Samsung LCD. It thinks my original setup (based on some online recommendations I came across six years ago) is a little too red, and after living with the results for a while and watching a bunch of content using the apps on the aTV, I agree.
What I’d like to know now is what my new settings are so I could transfer them to the TV.