Contact point is more a result of your swing angle. When you're out on the course for real you're never trying to hit the top of the ball or the bottom like we are in this game. You're just trying to put a good swing on the ball and hit it squarely. Where you put it in your stance, along with other factors will have big effect on ball flight.
When the ball is played back in your stance (closer to the right foot for right handers) it creates a steeper angle of impact. This causes the ball to pop out with a high trajectory and with a lot of spin. This is great for your scoring irons because you want high lofted shots that land soft and spin.
For long irons and woods, the ball is generally played more forward in the stance. This creates a longer sweeping swing with a shallow angle of impact. It creates a more normal or slightly lower trajectory when you desire more forward roll.