I had this same issue however these were the settings I used and it seemed to correct it. My torrents now download at my max line rate, and to be honest gives better rates when downloading multiple torrents over Utorrent.
My only gripe is with the p2p UI is the schedular, it will not auto download your que one at a time, it will try and download every torrent all at once unless you manualy set dates and times lol for each and every one. At least thats what I think it wants me to do, which to be honest is insane.
Anyway, settings.
p2p - enabled
auto download - disabled
port setting - auto
seeding - untill removed
encryption - disabled
Bandwidth Control Maximum Download Rate - 2000 [kb/S]
Maximum Upload Rate - 1000 [Kb/S]
Leaving bandwith control a -1 seemed to gimp my connection.