Home Network Load Balancing

I'm been downloading some stuff with bit torrent via RSS feeds lately. With all the talk of throttling by ISPs, and to achieve domestic tranquility by having the MRS not bitch about slow internet at home, I've implemented load balancing with pfsense and my 2 broadband connections.

With bit torrent opening up an assload of independent connections to hosts all over the internet, you would figure its a prime candidate for load balancing. Well its not. I'm still trying to figure out why, but to achieve any sort of reasonable performance, I need to force it to a single interface with firewall rules.

Anyone with insight into why this is, please fill me in.