Thank you for the precise and in-depth description of your procedure. It is most impressive that you are achieving these results using the same exposures for all colors.
A few thoughts/questions:
I agree with you that eliminating dichromate from the albumen would be desirable - have you tried the diazidostilbene in its place?
Does the slight magenta cast in the wet prints lighten when the prints are dried? What are you using as a clearing bath?
Are you working CMY or CMYK?
Once again, allow me congratulate you on your success - I look forward to seeing more of the merged portrait series.