When the clubface rotates the heel becomes the leading edge of the club and makes contact first so practice making dollar bill divots to eliminate that clubface rotation
Set up two hula hoops about a foot apart on your swing plane angle and then swing through the gap between them
Do not make tough bunker shots harder than they already are, when faced with a deep bunker with high lips play your stance and clubface square and let the loft of the sand wedge pop the ball up or just play the ball to a lower part of the bunker lip