Colour change from Light Magenta to Piezo Flush

I am trying to clear the light magenta channel on my p600 Using the QTR Calibration mode.How much should the colour change on the solid printed page when it goes from light magenta to Piezo Flush? Is the change slight or obvious?

I’ve printed about 16 solid pages at 50% saturation as well as run through about 20 head cleanings as twice in the middle of those solid pages the VLM would clog and need to have ten or more head cleanings before it would work properly again.

I notice a slight change in colour if I look closely. Now it’s less red than at the start and a little less saturated.

Have I printed enough pages to get the PF through the system, or should I keep going?