Under the bandwith options, I had 500 max global connections, and 250 connections per torrent. Make sure the maximum download rate is set to [0: Unlimited]. Reduce the upload slots for each torrent to ~2. Set the global upload to something small like 8.
Under the BitTorrent options, make sure encryption is enabled, and allow incoming connections.
Make sure the torrents are well seeded. Generally, if you can get onto private trackers, you will get better speeds. I hope these suggestions will help your cause!