Maybe I am missing something but with your Mac, are you not editing using a screen that uses the P3 color-space (not sRGB and not Adobe)? ***
https://www.color-management-guide.c...ay-review.html
** it seems that Apple uses D65.
https://en.wikipedia.org/wiki/DCI-P3...DCI-P3_D65.svg
So a question is
what color space does the video output connector use? i.e. can it be connected to a non-P3 display? If not, I understand that Eizo makes P3-gamut monitors.
Pardon my ignorance of later model Macs - my long-dead Performer was replaced by a PC years ago.
*** a danger being that a colorful image edited to your satisfaction on the Retina display can suffer gamut-clipping when transformed to sRGB unless the ICC output profile truly provides perceptual rendition i.e. has CLUTs.
Meaning for example that, if you accidentally posted an image here with an embedded P3
monitor profile (type mntr), it could get gamut-clipped or look washed out on my system when it renders P3 as sRGB
Roll on Rec. 2020 on everything ...