Actually rendering in Foxit varies system-to-system. I've seen this in person on a few machines at work and had no idea how to solve it until recently. I do believe there's an addon to the new Foxit 2.0 that solves it however. I forget the name of it, but if you go to Updates (nice new feature of 2.0) it will show up in the list with a description that should seem relevant to the problem. Download and install and your text rendering quality should improve.