Hmmm.... I'm going to send you some fresh OR ink. Please empty your OR cart, and refill it with fresh ink after shaking the bottle, then use QTR calibration mode to print flush sheets from the OR channel (I estimate you'll need to print 6-8 square feet of pure ink coverage with your 9900 to get fresh ink from cartridge to the print head).
Please keep me posted, let me know if you have further questions, or there's anything else I can help you with.
Best regards~ Dana