I ran across this while I was looking for instructions for the utorrent.
Let me know if it works.
I have been trying everything from that site for hours upon hours and no luck. but i do get an almost 400KB speed wich is not out of the normal. but my problem is that the speed is only maintained for a few minutes and then it drops to around 60-98KB.
someone reccomended this tweak guide here on this forum http://www.tweakguides.com/TGTC.html
i havent looked at it yet but its a 170 pages of tweaks so i think you should look it over.