Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

The problem: My download is fine but seeding is very slow and intermittent even for popular torrents. I think this could be improved using IPv6 via 6to4. 6in4 or 6rd, all of which are supported by my router, to discover more peers.

My ISP allowed me to forward the port so I am discoverable via IPv4, but doesn't support IPv6 and I understand the aforementioned technologies as a way to connect to a tunnel broker, which would forward my packets to the IPv6 internet.

However, they are another entity that can monitor my internet activity. Are there any, preferrably free, 6in4/6to4/6rd tunnel providers that are known to be torrent-friendly? Are there any firewall rules I should set up for my security, like only allowing IPv6 traffic to the qBittorrent port? My ISP doesn't care about torrenting so I haven't been using any kind of VPN. Should I?

Oddly enough, I have no problems seeding on a specifically Central European torrent tracker, which usually maxes out my measly 2 Mb/s DSL upload, but the dozens of peers at international trackers, some of which must be in Europe, barely leech data from me. Am I presumed to be slow because of a slow ping from the presumably American server, or is my disqualification from IPv6 so impactful? I find it strange as I can download from 20+ peers simultaneously and top out my 20 Mb/s plan.