Ive never had an issue with torrents i use the default ports 6881 - 6889 is it? well i only use 1 torrent at a time so it just uses 6881
everyone else i know who uses torrents on ntl dosnt have an issue either as long as the port is open or forwarded - i use shadows experimental but have used his new tornado version and the azura? version that runs on java ..havnt noticed much difference between them apart from one looks pretty but as a it runs in the system try i dont care about pretties as long as linux d/ls at 120k im happy.