I'm using the iPF6300 so I don't have the same print options you do, so I'm not sure what to set the halftoning to. I'd probably just set it to Auto unless you have reliable info that says to do otherwise.
Everything else is looking okay, but you can also try experimenting and printing another with Perceptual just to see if you like how it handles your reds better than Relative Colormetric (RC). For Epson's I do RC all the time, but for Canon I find myself preferring Perceptual (and especially Perceptual (People & Dark Places) when it its offered).
If all else fails see if you can find someone who has generated a custom profile for this paper to see if the issue is the profile itself (not unheard of). I like the
ColorMunki Photo for doing basic paper profiles, but better ones can be done with more expensive hardware and software. If you have a friend with a ColorMunki Photo, you can borrow theirs and give it a try on your printer to see if it solves the problem.
NOTE: I'm assuming your display is properly calibrated so what you see on screen is close to what you see in print.