Digital BW, The Print

This is my first post to the group, so thank you in advance for your help. 

Recently I purchased the MIS EZN ink for use in a C86 printer. I popped the cartridges in 
and tried printing, not realizing that there was a foil sticker that needed to be removed 
over the ventilation hole (no instructions were sent with the cartridges!). After I got those 
suckers off (which was quite an effort), my first print yielded terrible banding. 

The MIS tech support has suggested all these remedies, which I've tried to no avail:

1) Making sure ventilation holes are uncovered (yep! Poked a paper clip wire into them to 
make sure).
2) Leaving cartridges sit outside the printer for a day to eliminate any air bubbles.
2) Running a cleaning cycle (Did two for good measure, plus ran several nozzle checks. 
Perhaps a small improvement, but still there is banding).

Before using the MIS cartridges, I used the Epson color cartridges and had no problem with 
printing. 

I have noticed than the cyan prints fine, the black with very small banding, the yellow and 
magenta with the worst banding.

Any suggestion? Thank you,

LPipes