Colors coming out grainy except for black

I have an HP Latex 115 with Flexi 19, purchased brand new a few weeks ago.

Printing on SAV, 12 pass, 120% ink density, 18% optimizer.

The blacks print great, red doesn't look so bad, but all the other colors seem to be very grainy.
I know this has been brought up so many times, but noone has ever come up with a resolution.
I have printed optimizer test plots, color calibrations, media advance calibrations. Print head cleaning, print head alignment and so on. The only thing I haven't tried was running higher passes, but the ICC I am using is not allowing me to edit the number of passes on the printers touch screen.

Any help would be appreciated, and if someone has some solid answers, I will compensate you!!