Your problem is that you have a severely choked upload connection. A 64 kb/s upload doesn't allow you to receive much download. :/ Also, your speeds depend on the torrent. How many seeds and peers do you see? On a "good" torrent, you should download about twice your upload speed, in your case ~12 kB/s. But that's very rare, so on most torrents ~6 kB/s is more typical.