i don't have any answers for you as i'm in the same situation. my cable modem is faster than yours, i get 260-350 on the film download test, limeware usually shows me 'turbocharged' ... i've read and tweaked until i think i'll go mad - and d/ls slow to a crawl of 0-1 a lot of the time.

i had =one= dl last night that was about 220 and nearly fainted. the fastest before then was around 40 - most typical is in the 3-15 range. i'm flummoxed.

have had limewire for 3 days and used it a lot trying to make it work, but clearly, it's not useable this way.

uploads are even worse. i see struggles of 1-5 - and lots of stalling out at 0. i changed settings to allow only 2 at a time hoping that might help.

don't know what else to do/try.

sorry to piggyback on your post, but am hoping we might both benefit from those more knowledgeable about limewire.