That sound of the whip of the shaft through impact is a sure sign you've hit the ball with masses of power.
It's a simple idea but one that should never be ignored. As a drill, grab an old shaft or cane and try and realise the potential power you have in the hands and in the release.
Place a tee in the floor, address it and then try and swish the cane making as louder noise as you can. Really hear the speed of the shaft or cane as it travels past the tee.
Remember, the louder the swish, the faster the cane is moving! This is the feeling we want to achieve with our driver to gain more yards off the tee.