Torrents are better and faster on a private tracker.
What to do for the aussies they will be leeching, BAN THEM
Can aussies only download data, and not able upload data back ?
A tracker set up so allows only the ips that have been granted acces to be there. Verified from the ips used here as the same, you can tell if an ip is proxied or not.
Once a swarm gets going downloads will many times faster than ftp, for evryone on it.