Real colour blending not behaving

[Shasjas]

Real colour blending is something I'd like to make use of but it always produced too many overly saturated colours out of nowhere.
I thought the new paint mix profiles would help rein it in - maybe something in between AR6 real and RGB mixing.
It still seems a bit wild though.

I set all the mix combos to grey in the mix profile to try to understand how it works, and this happened:



Basically, it looks like it's not following the profile rules.