Canon 9500 II problem...
What software are you printing from? And, are you using the software to manage color with ICC profiles, or are you using the printer to manage color?
If you are printing out of Photoshop, hopefully you installed the printing plugin. If you do not use the print preview option, you should get pretty close to perfect prints just using the plugin to print.
You could go the color managed workflow route using the proper ICC profiles for the papers you are using. Both should produce nice neutral prints.
I'm using Pshop to manage the color, I've installed the printing plug-in, the print preview option is pretty useless for some reason because it's showing a preview much darker than what's produced and darker than the same print from both Mpix Pro and my 410, I've d/l the ICC profiles from Ilford, but for the purposes of comparison I've been using Canon's own Photo Paper Plus Semi-Gloss.
The problem seems to be intermittently blocked jets, especially yellow. One thing I didn't notice in the first run is that the gloss black isn't printing at all. I've gotten the yellow unplugged, I think, but the black is still not performing.