Thanks for replying.
Well, since my pending downloads in Overnet have been pending for quite
a while I may try and see whether aMule can do a better job... after the first
30 minutes it seems like I can control my upload well (assigning 3x5KB slots
on a 640/128Kb link that is uncapped on upload up to the physical link speed,
which is a 892/192) while downloads from a 86-source file hasn't yet begun.
I guess I'll sleep over it and see what it has done tomorrow morning :O