To continue this very helpful thread just a bit more, does anyone use Photo Lab Elite 3 as their processing software to then send to Qimage for printing?
Having a bit of a conundrum on the settings and would appreciate some guidance. Thanks.

Ok, sorry I don't know your name, but I have a Canon Pro 100 and love it to pieces as I told another person on here who just bought one.

I do not know if your monitor is profiled (properly) or at all.
But for the moment let me fill you in.
Terry is the expert monitor profiling person if you need advice there.
I had a Spyder Pro that I used for a long time, but Windows 10 doesn't support it.
The good news is that most decent IPS LCD monitors hold their colors pretty well, so a factory RGB comes very close.

The problem is your monitor is too bright. That causes you to darken the image to compensate, or even an image that is rteally too dark looks good to you.

Profiling the monitor aside, because I don't know if you have done or will do,
This works.
Use Canon Premium Luster or SG-201 Canon premium Semi Gloss and the proper profile that should be assigned to the paper type.
Setting the driver to  COLOR adjustment NONE, Quality to Highest, and paper type to match, Make a nice 8 x 10 or bigger print.

Let that print dry for 12-24 hours. This is very important as the dye ink will cure and lighten up.
Now, under a decent Ott light or at least a lamp with a color temp of 5000-5500K, compare your print to your screen. Reduce brightness and contrast until you match that print.
If you are using a Canon profile and Canon paper, it is printing the image regardless whether your monitor is bright or dark, on  or off.

You will come out so close you will be astonished.
Of course, nothing beats a proper monitor profile, but until then, try this.
OTT lights are around 25 dollars

Fred

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As a  long time user of both the Pro-100 and Qimage, thanks for this great info! I had not been doing much with either lately, but now back into it, I am having a heck of a time with overly-dark prints, and this appears to be the solution.
Can I ask, what are your printer/driver/ICC etc. settings?
Thanks!