Apart from that, do not forget to check your NAT setting. You may have to disable/enable UPnP both in utorrent and the router. If you are using private trackers then you'll also need to disable Local Peer Discovery and Peer Exchange in utorrent.
Lastly, limit your upload speed to 80% of your bandwidth. For example, I am on the same plan as you, and I keep my uploads limited to 20kB/s.