I just stumbled across this post, I'd seen the title but passed it by for later, which appears to be now.
I also have the Canon Pro 100s. Had it for almost 7 years, couldn't be happier. I often binge print, with dry spells in between, sometimes for a few months. Never had a clogging problem which makes me happy.
I use Red River papers. I tried sample packs of many others in the beginning, but RR just looked better to my eye, even papers that don't generally print well on that machine. I fell in love with the Polar Gloss Metallic, but it wasn't quite right for everything, borderline too metallic for some subjects.. They then came out with Polar Luster Metallic, and that is the paper I use the most. It might be worth getting a sample pack that has that paper in it for testing.
But as I said I'm generally happy with the colors on the printer. I tend to like a bit of "pop". So I've adjusted my workflow to give me a print that a like, and then "calibrated" (sort-of) my laptop to match those prints and PP accordingly. It works for me, and family and friends like the results. Before I started "reverse-profiling" I had a tough time getting satisfactory results.
The other thing that has help me is using Qimage Ultimate (QU). People either love it or hate it, I couldn't work without it. It's easier to use now than when I started with it about six months before I actually had the printer, trying to get used to it. And even though RR Polar Luster Metallic is my favorite, I like to play with other papers just to see how they might print differently, and QU makes such transitioning easy. Might be worth a look.
So that's my 2-cents. If nothing else, maybe it will stimulate further discussion on the forum.