1. Make sure you don't see a brick wall icon at bottom of your LW. If you do that means there's something causing a firewall effect making it difficult for people to upload from you.

2. Make sure the files are properly described. If mp3's, then make sure they have plenty of id3 tag information. Else, add good description via your LW Library window. Select the file(s) & press Describe button. That helps them be found in searches. Searches can link to description words too. You will need to Refreshen after doing this. Once you do this, you will notice your files will receive more Hits from other people's searches.

Personally I have about a 90-95 KB/s upload. I give 4 slots because I like to see them upload at reasonable speeds. I do tend to get people queueing though, but I'm sure they could appreciate the wait for the spot with a reasonable upload speed.