While I certainly do not wish to contradict sberlin, who certainly knows more than I do and I respect, it seems strange to me that chunks would be going at diff speeds on 56k.

Since 56k is more or less the effective slowest speed, he would be the limiting factor in all downloads, so the chance of someone uploading slower than he can download is very low. While I could see this happening if you could dl faster due to a high speed connection, wouldn't the chance of someone uploading slower than a 56k could download be pretty low? Cuz this seems to be a repeating problem.