Sadly no ipv6 support with my supplier so that’s sadly not an option. Vps and derp servers are both based in UK so doubt they’d be much benefit in switching from tailscales derp to pangolin. I’ll look into port forwarding but pretty sure ISP blocks this.

Would using something like pangolin be a solution to improve speeds rather than stuff going via relay it goes DNS->VPS->Local VM behind cgnat accessed via tunnel?