If you REALLY want to take a competitive approach to try and improve your ratio, you'd constantly REFRESH the Torrent Search function, and find only BRAND NEW torrents that have JUST BEEN UPLOADED, that you think will become popular torrents… and download only THOSE torrents in the first minutes of being offered here.
Also, I've found that if there's a very new torrent containing many files, and I download just a few of them, my upload ratio on that torrent will be very large. I was in "ratio basement" a while back after a disk crash, and this saved me.
