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It looks like it was because I batch scripted the printing, directly sending them to the printer from a command line app...as such the printer was interpreting the color space and I was getting different results per page...when I imported them all into photos and printed from there I got a consistent color, though more yellow than the direct to printer ones had been. All good now but I suggest if anyone else tries to command line/batch print that they look into setting the color space.
I'm having problems with some of the pages printing lighter/greyer than the others. For example 1 and 6 of the front b sequence. Has anyone else experienced this?