Instead of using the BitTorrent feature of S3, it might be more effective to check the popularity and health of your torrent, and then when it is suitable, spin

Instead of using the BitTorrent feature of S3, it might be more effective to check the popularity and health of your torrent, and then when it is suitable, spin up a small EC2 instance running a BitTorrent client to seed the torrent. You should be able to achieve better performance this way, and you can shut down the instance when the torrent is healthy. Alternatively, there is also the possibility of using the HTTP seeding extension to the BitTorrent protocol (BEP17/BEP19) which is supported by most clients.