Impact position is the most critical point of the golf swing and you must understand it is not the same as address, the correct impact position is how you compress the ball, get backspin and achieve your desired ball flight
Controlling the distance on your wedge is paramount to becoming a good player, go to the range and learn the exact carry distance for a half and full wedge and sand wedge and then add or subtract distance from those two backswings
Practice using the Bernhard Langer grip for distance control