Thanks Jon
Same to you 
The 7900 has had a head replacement. The dampers were fine, so was the cleaning station. The nozzle check was perfect with colors so I installed the Piezo flush carts for 20 minutes with an init fill. The maintenance tank was brand new from the head replacement.
Then I installed the Piezo Pro carts and did a second Init Fill. As reported I had the red staining in the light inks and the GCO. I tried to get rid of it by printing GCO sheet wise but did not succeed. Then I switched to MK and saw the same problem in the light and very light tones as well. Before doing a third init fill/cleaning I checked the maintenance tank saying that it still had 20 % - and it was flooding the printer…
After cleaning this mess, I entered maintenance mode and cleaned the very light and light tones (LLK/ and Or/Gr) pairwise using CL4. Before I did some testing with linearising but of course this does not make sense if the output is not how it should be. Blacks are impressive already. (> 1.8) … After the CL4 it looks as if the red cast has gone and I will restart testing before doing another Init Fill.
Just 3 more questions:
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how would you continue when using a different not-profiled paper such as Museo Portfolio Rag? Does it make sense to start based on the quad-curve from Moab Somerset Museum Rag?
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Have you seen the problem with the Color Pro target? It would be handy if you could measure the target from left to right and not the other way round. I will flip the target for now…
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Is there a way for printing channel-wise. There are files for channel printing in the QuadTone section but I doubt that they would work for the Pro inks too?
Just to add: I have already one very nice print, very close to Warm Neutral and no red cast on Portfolio Rag - just in time before Christmas eve
Best regards
Markus