Well, as you can see, the good news is I managed to find a 3-column blog template to use. Yay, go me (honestly, all it involved was a few simple steps).
That's it for the good news.
The bad news is...Disqus is broken. Their "template patcher" doesn't work with "custom templates", and for the life of me, I can't seem to figure out how to make it work with the custom template, even following the instructions from this page (which the Disqus support page sends you to when the "patcher" figures out it can't auto-patch your template for you).
So...I'm asking for help. I know some of you out there have 3 column blogs and are using Disqus. Can ya help a brother out and let me know how you did it? Or edit my template? Or...something? Please? :)
In the meantime, I've turned the "normal" comments back on. Whee.