I've been having some similar banding issues, only in Cyan and light magenta. Thought it could be a pressure thing, switched out the inks to full ones, but the issue persists.
Printing thru Mirage 2.0
Icc profile is correct.
Platent Gap is standard as well.
Tried a head alignment, no improvement.
Had a few dropped lines in a nozzle check, tried cleaning and failed.
Cleaned the wiper, sponge (both were fairly clean already), and cap area.
I'm thinking that the high cotton content of my stock has created a dust issue/clog somewhere on the head, in an area I can't access?
By the way this is my second head on a three year old machine w/ 1300 prints on it.
I'm replacing the maintenance tanks next. One is nearing capacity, maybe that's the issue with cleaning?
If this doesn't work it's either a install a new print head, or buy a Canon.
Any ideas/theories would be appreciated.