now core is always on heavy and aria(i hope i got the name right) is always on light. thats because people already have high level characters and strong clans on core and dont want to reroll. let them copy their core characters to aria with their clans and everything. that way more people will want to change and the server populations will be more balanced. now we dont want people to have 2 high level characters on both servers(not without leveling them ofc) so you can make some kind of a trial period. for example they have 5 days (after the transfer) to decide which character to keep the old or the new. after these 5 days they keep the characters on the server they want to play and the others get deleted automatically.