"He who marches out of step hears another drum." ~ Ken Kesey
Doesn't really look like a good candidate for 4cp. Why not just do black, yellow, and blue? Better color rendition and way easier on press...
if this is still set up, switch your print order YMCK, on press you can base down your magenta, strengthen your blue by adding a wee bit of standard plastisol...don't tell anyone I said that though.