hey
it's hard to figure out exactly what you're struggling with, cause I don't have superior drummer on my computer at work hehe
and also i don't actually work with logic.
But I'll tell you what the way I set up multi channel and maybe it could help with something.
In pro tools I remember that my superior drummer's mixer shows the outputs as output 1/2, output 3/4, etc.
I don't want to output a mono kick track in SD's mixer to a stereo track in the DAW, so this is the way I set up my multi out:
In SD's mixer, with mono tracks such as the kick, toms, snare, hats, i change the output to 3/4, on let's say, the Kick track and pan it all the way left.
The next mono track, Kick-Out, i also set to output 3/4 but pan all the way right.
Snare Top > output 5/6 > pan L
Snare Bottom > output 5/6 > pan R
Hats > output 7/8 > Pan L
Tom1 > output 7/8 > Pan R
etc.
In the DAW i make as many mono tracks as needed and then set the input of those tracks to match the output of my tracks in SD's mixer.
So for example, setting the input of a mono track in the DAW to Superior Drummer Output 3/4L, will only hear tracks from SD that is set to "output 3/4" and panned left.
Setting a mono track's input to SD Output 5/6L will now hear the "Snare Top" for example.
etc.
With stereo tracks in in SD's mixer I just output it to its own stereo pair, and keep it panned as is, and also just make a stereo track for it in Pro Tools.
It might be a bit more work than other solutions, but I have yet to find another solution that worked for me, so for now I'm sticking with this.
The "multichannel" option in SD for some reason, which I can't remember now, didn't work for me the way I wanted, so thats why I did the multi-out thing this way.
What i've done to make it even easier is to set up entire kits and do all the multi-out routing, making sure every little thing is set up to work the way i want, and then save it as a DAW template so I can just import it into a new session and rock out!

I even save some templates with some plugins and effects set up in the DAW so I can just import it and instantly have a kick@ss drum sound hehe
Hope it makes some sense

Cheers cheers