I don't think the Data Centre is the cause of the lag problems. I am in the UK and while i see pings over 100ms it doesn't effect my game play.
MMO's don't need low latency like FPS games do. I used to connect to FFXI back in the day at 180ms and was able to do everything without any problems.
Unless there is something i don't know about that makes this MMO different to all the other MMO's i have played over the years with pings anywhere between 150-250ms i don't see the issue.

I am not saying it wouldn't be nice to have an EU date centre but i don't really see the need for it.