Thanks for the update and your feedback. I'm glad to hear you were able to get all the carts working, though apologize for the what you had to do to get them working correctly, and the frustration you suffered...
I saw your post come thru my email before you edited (so the non-edited post is no longer on this thread), and wanted to clarify the "NO cartridge" error when the printer is first turned on is normal when using refillable carts, and simply opening and closing the two cartridge bay doors resolves that message.
With the 4900/7900/9900 and 7890/9890 printers, the power clean cycles are weak compared to previous models. With previous model printers, such as the 7880/9880, 7800/9800, 4880, 4800, 3880, 3800, etc... three power clean cycles was enough to move ink from cartridges to the print head. With the newer models, you would have to do dozens of power clean cycles to move ink the same distance. For this reason, we recommend doing an initial fill cycle when changing inks or flushing a printer. Initial fill procedures can be found here: http://www.inkjetmall.com/tech/content.php?151-Initial-Fill-Procedures-for-Epson-Pro-Model-Printers
I hope this helps.
Please let me know if you have further questions or there's anything else I can help you with.
Best regards~ Dana