The only real solution to the Balmung problem has already been said time and time again and the devs refuse to do it: Designate another server as the official RP server and offer transfers.

You do that and a massive chunk of the population on Balmung will leave. Not only that, label Balmung as the official raiding server or something and that chunk of the community will stay. Done. Problem solved.

I'm not kidding. Mateus became another secondary RP server but the overwhelming community on Balmung weren't going anywhere because Roleplayers thrive on their community. Their friends, their enemies, the FCs and events around them. Unless everyone has a reason to leave, they never will. Designate an official RP server and they WILL go.