This is the biggest issue I see with golfers. They open the clubface at address. Remember my goal with all bunker shots, all instruction I give is to get the bounce of the sand wedge to work the way it was designed to. You may have heard to open the face at address, but what you really want to do is the keep square and lay the shaft back behind the ball. Setting up square exposes the bounce to the sand and adds loft to the face. This would have the ball slightly in front of middle. You don't want it way up off your left heel. Your hands need to be low, which would have you a little farther away from the ball. Having the club shaft flatter at address increases the effective loft.