Are you previewing at 100% magnification/zoom?
Do you have the Zoom Quality preference set to More Accurate?
Have you tried a test render for output quality?
Test render proved that there weren't any problems. I should have tried that in the first place. Sorry for wasting your time.
Another question, unrelated, I'm using a 3d camera controlled by a null object. How do I keep an img background behind the text at all times? I just want a simple radial gradient.
Make the background 2D