When playing a bunker shot play the ball off your front heel and make sure that you hit only several inches behind the ball so that the bottom of your swing arc is directly under the ball
The difference between your address position and impact position is that your clubface delofts one or two clubs, not getting the handle get in front of the ball on impact causes you to add loft and lose tremendous power
Ball back in your stance, weight forward, closed club-face and hit down on the ball