I discovered a work-around which is to tell the printer the paper is matte photopaper and to print high quality.
It takes a while to print like this because it's using the photo ink, but for my needs it works because I don't do much printing.
I'd love to get to the bottom of why it won't print well from the text ink cartridge though.
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Re: PIXMA iP7220 printing pattern of blurry and clear lines
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