I've not given up on it so much as switched to another deck that I think will have a better shot at Columbus. My most recent list is something like this:
(list)
I think that's it, but I may be missing some cards (lands, most likely). The deck is pretty strong, but I'm not sure if that's due more to surprise factor or actual strength. Assaults should be something else; possibilities include going back to a black splash and having them be Maelstrom Pulses. I'd be kind of interested in testing Sprouting Thrinax in a straight Jund NO shell, but we'll see. I don't think Aggro Loam currently has what it takes to make the top tables in Columbus, given that Reanimator and Storm combo will probably be the two most popular decks going into it: Storm is almost unwinnable and Reanimator is pretty grim even if you have access to both Swords and Edict effects because they can always just get a shroud guy and beat you senseless.
It might be worth swapping Libraries to Scroll Racks. Accidentally drawing Progenitus is kind of a bummer for this deck. Sideboard Terastodon is actually a massive beating against aggro as another NO target (blow up three of your lands and it's almost impossible to race you, plus you can recoup what you lost pretty easily).
The sideboard is kind of up in the air, but I'd recommend starting at:
1
Bojuka Bog3
Tormod's Crypt3
Krosan Grip1
Terastodon1
Nomad Stadium
...and going from there.