Alright, looks like the exp cap is fixed on the difficulty. So the exp cap hits each difficulty. So you can basically only kill 2 ogre's(standard difficulty) for lets say 1 bar of exp each. So that means you can only get a max of 4 bars worth of exp from Easy and Hard mobs as well. For a total of 6 bars. That's what I have so far. Haven't had time to test it more yet.