What torrent client do you use?

uTorrent 2.2.1 and Deluge on dedi server as it has more aggressive peering.

For anyone talking about uTorrent being unsafe and having malware / crypto miners bundled with it. The latest clean version of uTorrent is 2.2.1 and 100% safe to use, but I wouldn't use anything after that version. You can use http://www.oldversion.com/ to download it.