I have a similar ruleset regarding ratio but mentally I think about time spent seeding. Active torrents I can reach well over my minimum 2.0 ratio by leaving it seeding overnight. Meanwhile, I had a torrent one time for open source software that was very active but had a very large proportion of leechers to seeders. I left it seeding for several months uploading several terabytes in the process. My seed ratio was in the several hundreds but I was happy to take keep the CDN costs off the site.