Thanks guys, just remembered I made this thread. It's nice to see some constructive criticism, since it's something you don't find on a lot of forums.
I forgot to mention this was my first time doing any kind of product photography, and looking back I seem almost scared of getting too close in. So much so, in fact, that I was way to far out. I agree, it should fill almost the entire frame.
I've bought myself an exposure meter since so my exposures should be spot-on now.