Canon ifp6450 prints a bit too grainy?

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Nightmare
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#1
The prints are OK, but not entirely clean as I'd like ideally in the uniform colour areas, particularly lighter shades. Prints may appear somewhat grainy, like higher ISO...

I tried head height standard adjustment print but it hasn't improved it

It appears to affect colours from both heads, one of them very recent, and all papers. I am sure it is some calibration needed. I would be very grateful for the pointers to the right direction.
 
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