"He who marches out of step hears another drum." ~ Ken Kesey
I would print black first, then ploy white, flash then poly white again. On maroon, put choke the white or black back .5pt, you will never see the maroon between the 2 colors, but you will really notice it if the white and black are smeared together.Use a low build black, some build up like crazy, others don't.
On poly garments it can look strange to have one color (the black in this case) right on the garmentand the white high and possibly glossy.