TX800 White starts out not white

Hello. I bought a UV printer CMYKWW. A3 size that uses 1 TX800 printhead. I have the same problem after changing the print head 3 times. White on the TX800 has 2 inputs, meaning 2 hoses and 2 dampers connected. One for spot and one for basic white printing. The issue seems to be the same for both spot and basic white printing. After some time of printing black for example, you start to print a solid white test square and it is not pure white. It is grayish. There have been times it was blue-ish as well. You must run clean routine which pulls ink out of printhead with a vacuum built in clean process. Then print some test white squares, clean again, print more tests until the white runs pure white. This has become a mandatory routine. You cannot just print something white without testing, and cleaning. I dont have drops leaking out on the table. This happened on other TX800 heads, which after they clog I replace with new and it's still not pure white ever until cleaning.

Anybody know how I can solve this?

Thanks

 

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