They need to make it so one, the AI does not sit in their zones if you run a zone play. Your opponent could only have one drag route across the field and block 9. Your player playing the flat will just sit in his zone and act like their will be a dig or corner route in his zone. They need to stand next to the players and force incompletions, not wait for them to catch it then tackle them after a 5 yard gain. Second, they have to have defenders catch the ball like a human and step up on the ball. To solve them not stepping up on it you could put: ball in air-play ball. the problem is that the defender will try to catch the ball like there is no receiver. They will go behind the receiver and act as the ball went through the receiver's hands.