Not a direct solution, but they could add Allied Seals to the original Crystal Tower. That would encourage players to play Crystal Tower (it's a dead zone now) and help with the overcrowding.

They could also approach marks the same way they have with the hunting log. Add the marks to the existing hunting log under a new tab. Players can receive rewards for killing the different marks once a week. If the player manages to kill all the marks listed, they get a big bonus. Players do not receive rewards for killing marks repeatedly in the same week. The log then resets on Tuesday along with the other content in the game. The exception to this would be the Hunting Bills, which rewards players for killing the mark listed on the bill, even if they had already killed it once that week. Once they've claimed the bill, the bill disappears.