256 kbps upload ability is about what you said, around 27-28 KB/s. Remember that there's always overhead loss. eg: http://www.pmasoft.net/englisch/oe/r...20internet.htm
Which represent between 13-over 20% of isp dedicated speeds.

Perhaps this might help: See the following link & follow "ALL" the off-shoot links to find hints & extra skills to help solve your problem: To continue files downlding (click on link)