howdy.
im no network guru, but here's the few things id try to troubleshoot whats going on...
1.get a network monitor to watch bandwidth usage. many isp's offer a network monitor to check the daily, weekly and monthly bandwidth usage - check your isp's downloads or support pages. if nothing specific available, try -
surplus meter -
SkoobySoft - Skooby Utilities
istat pro -
iStat pro, a Dashboard Widget by iSlayer
istat pro is an essential widget - grab it regardless. it doesnt do usage monitoring, but will let you see what the current connection speed is, perhaps will help to identify spikes/troughs when you start various apps or connect devices like your tc.
2. try a different torrent manager. i use
µTorrent - The Lightweight and Efficient BitTorrent Client for Mac - its a very small, lightweight yet powerful app. alternatively, try the big gun, vuze (formally known as azeurus) -
Azureus, now called Vuze : Java BitTorrent Client - How To: Mac OSX
once you have the bandwidth under control, and a usable, functional torrent app, reconnect your tc.
yep, you can definitely set up the tc with the router.
if the tc hasnt yet performed its first back-up, plug it in physically to you're mac. using wireless for a first back-up is usually a bit slow and painful. if you've got the first back-up sorted, set the tc up as a wireless device (or lan connection, whatever suits) and all should be sweet.
hope that helps. its not detailed instructions to click this or select that, but troubleshoot the root problem and you should be good to go.
good luck, let us know how it all goes.