Jon forwarded me emails you sent him (similar to what you posted above, but with a slightly different nozzle check).
I see a is-firing nozzle in your yellow channel (far right) that would cause dark banding due to two nozzles printing top of each other (I labeled the first nozzle check you sent, and attached below for you to see).
Is this banding only in the mid-tone to dark shadow range of your printed negatives? If so, then I suspect this mis-firing Y nozzle is causing the print problems, since black (which has obvious problems in the newer nozzle check you attached above) isn't used for printing digital negatives, and yellow (shade 2.5) isn't used for printing with the P2M-PZDN system you're using.
I also noticed the vertical lines between each ink channel are parallel/next to each other, not overlapping like they should be. Please attach an alignment check (On Pictorico OHP film) for me to examine.