From the teeing ground or driving range, I never use a tee for iron shots, hybrids or fairway woods for that matter. Teeing up certainly makes the shot easier but it is just sending the wrong message to ones brain... tee it up so that one can get under the ball. Then one hits a lovely shot from a tee and says, "I got under that one nicely". In reality a ball on the fairway does not have much room under the ball.
The best fairway shots are played by compressing the ball with the face of the club on a downward motion and the club sole and leading edge make contact with the ground after impact. This compression along with the loft of the club face initiates backspin which in turn creates an upward flight far greater than the loft should allow.
Fairway shots should always be hit on the downswing allowing the physics and design of the club and ball to do the rest.