Practice swinging with your front foot turned out almost to the target which will stop you from shifting your weight to your front foot on the backswing
There are four sources of power in your swing: the wrists, the arms, the pivot and your ability to syncronize and time the movements
Do not approach your chipping stance like a full swing stance, keep your feet close together, slightly open, weight on your front leg and shoulders square to the target, this set up clears your hips prior to the shot and puts more of the toe of the club flat on the ground