First, that Preview printed without the issue you report points to an issue in Photoshop or how you're setting it (although it looks OK).... IF you wish to see if Photo Black is 'getting though' you do a nozzle check but you said you did. But what I see from your first post really still appears like not all inks are firing. But that's an assumption. I don't see how you can print without the Epson driver so how can it be uninstalled? The Epson driver isn't IN applications. It's installed such you can go into Printer and Fax and load it there.