No - sorry, I was unclear. I removed many of the outbound links from my page - I have no control over any of my backlinks at all because I didn't build them.*
And yeah, I had assumed trackbacks wouldn't affect me, but they are the only difference between my page that got whacked and my very similar pages that did not.
(*I suspect the page fell further because I made a number of changes around that time, including a new domain name for branding purposes. Let's actually just disregard that part of my post since it really isn't relevant.)
I think I'm going to get rid of the post for a while, so the trackbacks will land on 404s if the bots follow them. Eventually, I may post it again under a new URL and see if that gives it fresh life.