To resolve horizontal banding at higher resolutions only, upgrade the printer's firmware to I00642 or later.
If you see improvement after you print the nozzle check, continue with another head cleaning and nozzle check until the issue is resolved or you see no further improvement.
If you cannot match the Media Type in the driver/RIP with the media installed in the printer, paper feeding will be slightly off, causing thin light or dark bands in the print. To correct this problem, some RIPs have a paper configuration option which you can use to calibrate the paper feed for the media. If the RIP does not have a paper feed calibration, you can use Epson Printer Service Utility 2 to create a custom paper configuration.