Chunked chips usually come from too much hand action. Golf Digest No. 1 Teacher in America, Mark Blackburn, teaches a more reliable approach.
Instead of stabbing at the ball, let your body rotate through the shot. Using your bigger muscles keeps the motion more stable and predictable.
Make small, controlled swings while turning your chest through the ball. Let the club move with your body, not just your hands.
Use this around the greens to improve contact and keep chips from coming up short.