Tint tools: Does it only work in “Brightest” color picker mode?

Hi, General question! I have many of my color pallettes made from color picking a “Spectral”-ly most accurate variant of a given gel. When I use the tint tools, it’s like the channels jump to the “Brightest” variant of the given XY coordinate and then tint from there. Is that expected behaviour? I would like the jump in brightness to stop happening if I’m tinting Spectrally more accurate gel picks.

3.2.5 Apex 10