I see that that the USA server is having a little hard time on trying to get a player count, since am always on the BF3 or BF4. drop the Close quaters, snice BF3 was not really made for that...this is just a few ideas from other BF3 servers that i enjoy playing on and that keeps above 40 player count though out the day.
Make the game mode Conquest.
make the map rotations:
Operation Firestorm, Caspian Border, Kharg Island, Noshahr Canals.
keep the ticket rate as normal until more player join the server and then when more players on on, raise the ticket higher when need so that will keep the game for ended to fast.