Last week was free leeching as an anniversary thing so you could have gone for your life and no effect on your ratio. However, the site was overused all week so half the time you couldn't get on. I saw a lot of Rhinos. (CG members will know what I mean if they were on it last week.)
I used to have trouble with my ratio but maintain mine now strictly through seeding. Choose what you download carefully and keep it available for seeding afterwards and you will be surprised how easy it is. Also, download the featured movies on a regular basis (and as early as you can) and they will definitely seed from you while also having bonus value. This will bump up your ratio without ever uploading a thing. Lastly, where possible, download other stuff which has bonus value. Most stuff in the various projects have this benefit (SW's included) and this will keep your ratio in better shape.
Hope this helps.