Typically downloads depend on the hosts providing the sources, so could just be slow sources (especially for the 2 - 6 torrents).

However, the 30+ host torrent should be faster, so hard to say whether there's a problem with the setup. Don't think so, though, because the torrent setup in LW is supposed to handle the setup automatically.

Check out the torrent preferences in LW, but I suspect all is good there.