Is file compression being used with this FTP connection? It could be that the actual KB/sec transfer rate is being slowed by the compressing/uncompressing of the file. You can set the compression settings within the Site Manager for the site. If compression is the issue turning off compression may end up speding up the KB/sec transferred but make the transfer take longer anyway as more would need to be transferred.
Posting a session log of these slow transfers would be helpful.
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