I think you can use ports up to 64,xxx, but I'm not sure of the exact number. I usually tell people to pick one between 50,000 and 60,000 and things should be fine.
Voodoo, I'm not sure why that is happening. I've seen it happen to me also on some trackers. It happens constantly when I'm on a torrent with lots of seeders - it seems the leechers connect, then disconnect, then connect, etc. and then the speed goes up, then down, then up... I solved the problem by just not watching it.
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