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The proxying works fine in Deluge. It's not leaking. The trackers communicate by TCP, the traffic is TCP. It works. The attack that is mentioned in the second article stem from applications that ignore your proxy and send traffic by UDP without tor. That doesn't happen here. Both the trackers and the traffic are proxied through Tor as TCP connections. I dissmiss that complaint/claim.
As for slowing down the networks, with download speeds at 250KB/s I doubt it. Thats about what I get using wget behind tor. Rate throttle it if you want to be polite.