Then it's probably your network, EU1-3 are running on the old machine (Hetzner).
Ok, if the in-game server list ping is anything to go by the four mentioned servers are all more or less the same and equally unstable across the board. Good to have more to work with now. Will try changing my ISP again, though it made no difference last time. Perhaps it's even my mainboard that is getting tired, but then again I don't have any problems when running for example speedtests.
edit: could it have anything to do with ports and portforwarding or some such, I'm really running out of ideas?