The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
@Brutus5000
Switch relay server to https://www.ovhcloud.com/en/security/game-ddos-protection/ or something like that which should be more ddos-proof. As for worse connection through relay server check if the relay is properly handling PMTUD and check for buffer bloat and try to fix that.