Are you using public or private trackers? Which torrent trackers are you sharing through?
I wouldn't be too worried about it anyway - the worst that will happen is that your ISP will boot you after the BPI whine 3 times to them.
Encrypting the data won't work - the BPI just check the IPs which are easily available.
Peerguardian my help a bit but it's not foolproof by any means.
If you don't mind spending a little money (€45 for a year), then sign up to a darknet like
Relakks - you're then effectively untouchable.