If you have a perfect nozzle check and are still getting some banding - across the print that is, and not just in the first and last inch, which is an unavoidable artefact of QTR on non-Pro Epson printers - then it may be misfiring nozzles.
A LOT can be determined about the health of your printer by evaluating a printed MANUAL nozzle check pattern- it's not just to check if all nozzles are pr...