The solution is to download ONLY new torrents.
And when i say new, i mean torrents that just uploaded to the
tracker.
Download new torrents, even if you don't really need these, until you make a good
ratio.
Then you will be able to download whatever you like.
An other good way to maintain a good
ratio, is to download as many Free
Leech torrents as you can.
Finally, the best way to upload in "difficult"
trackers, is to use the
RSS feed. To use it properly, you must have your PC online
24/7, in order to snatch the new torrents automatically when they come out.
Just choose some famous TV series with many snatches every week, setup your
RSS with these releases... and your problem is solved !!!