So you are having hard time because of charge attack... Look there're many ways to stop a charge, Pounce, Mounted Skirmisher.
1st: Difficult terrain. But Minotaur Belt ignores it.
2nd: Fatigue. You can't charge under fatigue condition. Ray of Exhaustion, and Wave of Fatigue spells work very well.
3rd: Strong winds. Flying creatures have to make hard fly skill checks. If they want to charge under this condition.
I don't see any point why you can not handle charge attack...
By the way Death from Above (Mythic) does not grant you free action to trip attempt, the feat only increase critical multipler by 2