The effect you described in the initial post of this topic is typical for torrent clients not being connectible. As soon as there are other seeds available which are connectible, the clients of downloading peers will be better and faster served by those connectible and (almost) nobody will need to download from the not connectible. So the not connectible is used as source only as long as he is the only source.
There are plenty topics about this, just look in the Guides section of the Forum.
That's odd because I was pretty sure I was connectible (connectable?).
Anyway, I just want to confirm that using uTorrent definitely solved the problem. I've been seeding like crazy this afternoon.