It sounds like you are having an exciting time with the type of excitement you could do without. My 4 - yln, saddleback, double saddleback, and falcula - get along fine except at feeding time, and it isn't too bad then. You have a lot of room, so you would think they would spread out and not fight.
I have upped the amount of food so that may help, plus I feed my aggressive fish, the ulietensis, some pellets before putting the main food in the tank. I also spread the food around and leave my Vortex and another powered running to spread the food out.