Amateur question on color

I'm printing to a Canon iP6700D (very nice for a very cheap printer). Canon gives ICC profiles cryptic names, but I'm sure the "Canon iP6700D SP2" profile is the most appropriate one for the various Premium/Premium Plus glossy photo papers I use.
The difference between Onscreen Proofing on and off is clear, and the same difference is visible in the print dialog's large preview, when I switch between System Managed and the Canon profile. So far so logical.
The trouble is, I don't like it: too light and washed out. Choosing System Managed in the print dialog gives a result more like what the image on-screen (with Proofing off) makes me expect, and more like what I want.
My question is this: Aside from the obvious answer (print whichever way looks better), what am I missing when I don't use the profile (or some profile) in Proofing and in printing?

Thanks. I understand I need to manage color either in Aperture or in the printer but not both. In the Canon print-driver dialog there are two tabs with relevant settings. In the "ColorSync" tab there's only one option, "Standard" ("In Printer" is grayed out). In the "Color Correction" tab, I choose "None" rather than "ColorSync" or "Driver Matching." As far as I can tell, I'm making the right choices whether I'm using "System Managed" in Aperture or choosing an ICC Profile in Aperture's print dialog. Is that right, or should I be using a different "Color Correction" setting?
But in any case, my main problem isn't coordinating the application and the printer. If I print with the appropriate (I think!) ICC Profile, the print does pretty well match what Onscreen Proofing shows me -- but both the onscreen image and the print are too light, washed out. I get better results if I switch to System Managed when I print, better both on paper and onscreen (with Onscreen Proofing is unchecked).
In other words, I don't like the ICC Profile's results, anywhere. I've tried all the Canon profiles I have. Eight of the nine give the same washed-out result. The one that seems most generic, "Canon IJ Color Printer Profile 2005" (all the others contain my printer's exact model number), looks much better -- but it looks exactly the same as if I weren't using any profile. If I choose it for Proofing Profile, checking and unchecking Onscreen Proofing makes no visible difference at all.
So should I just give up on profiles and use System Managed?

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