I just spent the last 3 hours, not playing this game but trying to help a friend into manipulating which server he would land on (by blocking his current laggy server ip) and it did not work.

If it still isn't resolved by tomorow, i'll try to set up a tunneling program so he can connect to the servers through my computer.

I logged in using HIS account on my computer and got 0 lag. I also ended up on a different server than him.

It seems like it may also be region based.
Aka some regions log into 2-3 specific servers, while someone 100 KM away (like me from my friend) will end up on a different server cluster.

Note : don't confuse a server with a world. 1 world (Hyperion) in my case is using many servers, the guy next to you is in the same world but probably not on the same server)