When you are faced with a pitch shot that you need to carry over trouble but still have room to let the ball roll play a medium height shot. Narrow stance, ball centered, weight slightly forward, minimal wrist hinge, more body movement going through than
The position of the ball in your stance is determined by your swing shape and the club you are hitting. Your wedge should be near the center of your stance and your driver should be off your front heel.
For downhill lies reposition your club and body so that your stance is parallel to the slope your ball is on