If your file finishes and it's corrupted, run the bittorrent again and resume that file. Bittorrent will fix it.
I do option C (upload 3 and number of uploads 2) because I have a cable modem transfer limit that costs me $20 when I go over it and $20 for every GB after that. This month I went over it again because I couldn't wait for more Macross 7 (just watched ep. 10. I love this anime). Yes, this still makes me like Dennis Leary, but if I'm going to do a big upload, it has to be on a month I'm not watching Ultra Maniac and Macross 7, then downloading Mandrake Linux 9.2, and reading 5 message boards.