Clean up impact with a towel
Good ball-strikers get it done their own way, but one thing they all do is hit the ball before they hit the ground. To get that clean, pure contact, give yourself a reference point on the ground.
Set a small towel down and make some practice swings with your 8-iron where you hit the turf in front of the towel. Once you do this three or four times, place a ball five centimetres in front of the towel and hit a shot (above). If you try to lift the ball into the air, you’ll catch the towel before you strike the ball, which means you need to make a more descending strike.