Free leech is nigh useless on a music tracker such as what/waffles. It's such a rare occurrence that those torrents are way, way over saturated with seeders, and it becomes next to impossible to gain upload credits through that method.
Contrary to normal ratio building methods on 0day trackers, there are no "popular" torrents that get downloaded far more often than others and are great for your ratio. Your best bet is trying to spread your seeding to as many files as possible and keep them seeding as long as possible. It's slow, but it works.