Ugh, nevermind, I figured out the problem I guess. I don't think I'll be able to do what I want. My adapter isn't dual link, so it can only go up to 1920x1200. There are active dual link adapters out there that appear to require power over a USB connection, but they all cost around $90-100, and I just shelled out $135 for the dock. At this point I'd rather sell my trusty old 30" fluorescent backlit monitor and get a newer LED model than waste a hundred bucks on an adapter.

If anyone has a suggestion I'd love to hear it. Feeling pretty disappointed right now...