I think all servers need merged until they reach the numbers found on servers 1-5 of active accts.
Too many people have these servers with under 100 players per server.
Most of the realms on server 1 have 100 players per realm.
SO stop opening the new servers ad merge alot more servers. Then after all those mergers open a few new servers. DO another round of merges then more new servers. trust me this will work better
My guess is that the reason server 1 has so many active players is because they are the hard core players that were part of the beta.
The opinions expressed on this post are my own as a player, not as a Moderator.