static coming from FL can be for a number of reasons...
first thing to try is, like he said, render it in higher quality, but i would strongly suggest you go way higher than 128 if you have the memory. preserving sound quality is the most important thing you do once you have a finished beat. i always use the maximum bit depth for both wav and mp3 (think its either 320 or 360) to keep better than cd quality sound. see if that helps..
usually buffer size shouldn't matter with rendering, as far as I know, I've usually had to mess with that more for MIDI input problems.
if its intermittent static i would really think its a problem with your samples or sounds...its one of the frustrating things i had to learn when i started sampling...sometimes you'll find something golden but there's just too much static to use it.
as far as burning to cd? I would render a max quality Wav file and then burn an audio cd from that in itunes or a similar program.