Did you check the file with Bitzi? 500 sources is massive & I'd be surprised if most of those sources weren't fake.

The more real sources you download from, the better chance you have of a faster download. Depending on your speed, host(s) speed, the amount of upload slots they have open etc.

Yes, the comments said it was perfect. I don't think the file is fake, it seemed fine when I previewed it. Please, I just need to find out what tweaks I can do to make the speed get up towards at least 80 or 100 KB/s! Thanks.

Check out the link below for tips on optimising LW's performance.
Configuring LW for best performance

A lot really does depend on the people you're downloading from - their bandwidth & how they have their LW options set. All you can really do is set your LW up to perform at it's best.

I've read that guide many many times before, and it didn't help that much. What should I do with my upload settings, for example? Is it best to have the bandwidth set low or high, and how many users should I put it at?