[Unplayable] Severely poor connection since 4.0 (server relocation)

[Claviusnex]

SE said it was a higher IP problem. I.E. there isn't anything they can do about it. And that's believable considering theres only so much they can do.

That higher ISP problem is the backbone provider who happens to be NTT in this case. I'm not sure who is doing the game server hosting but the backbone provider selection is up to them and likely SE so there is a lot they can do about it. One is to find better providers for server hosting and backbone access.