So I accidentally rendered the back channels on the wrong side, gotta do the AC3 again. That doesn't take very long though.

Surround is difficult for me as I only have a pair of headphones that simulate it as far as a set up goes. It takes a bit of trial and error. I think everything is correct now.

You should've seen what adywan sent me to fix it. I sent him a snapshot of my Vegas workspace, and he sent me back the image, annotated with everything I'm doing wrong, which I assume he made in photoshop. Badass.