I started on Brynhildr on the Primal Data Centre (the same data centre as Behemoth). Endgame became impossible to complete at the end of the day because of massive latency issues. I also tried rolling an alt and checking out uA on Behemoth with the same issue. I moved to Tonberry in April and haven't looked back.

You need to be ready for the fact that the Japanese do play the dungeons differently. Some Japanese groups will speed run. A lot won't. Running Coil and SCOB, some free companies run static groups. My FC is looking to put groups together that run t5 (for some of the newer players), t6 and some that run through a weekly clear of t6-t8 and practice t9 together. A lot of people look for practice parties in party finder and after getting some decent practice, they change to clear parties without being in an organised static.

If you're on Ton and I'm around - feel free to send me a /tell and I'm happy to talk some more or make some other suggestions.