This really brings back memories of the color darkroom! Have you done a color perception test, like this: Color Test - Online Color Challenge | X-Rite ? It might identify a very specific area where you have less acuity and this might help your color adjustment work.
Curious that you do these blue/magenta and green/yellow but you do not do red/yellow or magenta/red or cyan/blue etc. In other words you've selected only two out of six possibilities. The rational escapes me.