soft-proofing troubles

I'm fairly new to Lightroom and printing, so I honestly can't tell if I'm just missing something obvious.  I think I probably am.  Here's the issue:  I've been printing on a Canon Pro-300 with generally acceptable result, meaning the prints matched the screen fairly well in terms of color, until I tried to print a field of fall color bracken ferns.  On screen, the ferns look very red, but the print shows them as more orange.  My monitor is calibrated.  

Here's the part I don't get:  If I use soft-proofing (using an ICC profile from Canon for the paper I'm using, which in this case is Pro Premium semi-gloss), Lightroom shows me (on screen) the effect it will have, including the out of gamut areas, and I can make adjustments to get the side by side comparison between the original and the soft-proof version to be pretty close (on screen).  Then I print, and it looks nothing like the soft-proof version.  I've tried various things (perceptual vs relative, etc).  No matter what I change, the print doesn't look like the soft-proof.

And here's a more confusing twist.  There is a setting for "profiles."  NOT the profiles you install for paper/printer combinations (ICC Canon, etc), but the "profile" listed in the Develop module (Adobe color, Adobe Landscape, Adobe Portrait, Adobe Standard, etc).  For some reason, the default appears to be Adobe color, but if I change this to Adobe Standard, the screen matches my print exactly.  I mean, perfectly.  To be clear, I mean that I turn off soft proofing entirely and, in the Develop module, I switch the "profile" to Adobe Standard, and it looks exactly like my print.

So, why am I complaining?  

Well, it's great that, on this particular print, I can make the screen match the print by simply switching to Adobe Standard profile in the Develop module, but clearly I'm not using the soft-proofing feature correctly, or there is something wrong.  I have made 5 different prints, with all kinds of different adjustments made to to the soft proof version created, BUT all 5 prints look identical to EACH OTHER (the paper prints all look the same), BUT the prints don't look like any of the soft-proof versions.  So, in other words, whatever changes I make to the soft proof versions have no impact on the output of the printer.  I've triple checked printer settings.  Lightroom is managing color (not printer).  

Help?