Does your issue have anything to do with switching from Aperture?
In other words, if you take a new photograph with your camera, and import it in Lightroom, then export it, is there still a problem?
Or is the problem somehow tied to transition from Aperture, or photos migrated from Aperture...?
I'm guessing the reason you brought up Aperture is that you did not have export "color loss" issues in Aperture, like you are having in Lightroom, but since you didn't say... (just want to be sure).
Correct, color loss was not an issue with Aperture.
I especially notice loss of skin color in LR exports.
and exports from PS seem to be even worse.
tonight I'll do some comparisons with a shoot
I did over the weekend,
aand get back to you on your question.