FAULT: INCORRECT IMPACT POSITION
In this picture you can see the shaft almost leaning away from the target and the weight is on the back right foot. More importantly I am falling away from the target which puts me in a very weak position to deliver power to the ball.
FIX: IMPACT BAG
The impact bag is a tool used to create the correct position at impact. The resistance of the bag causes your hands to lean forward and the shaft to lean forward during the impact. Also, to make this happen you must use your lower body and abdominal region for power or you will strike the bag with a glancing blow. We want the bag to move forward after impact to produce explosive power into impact. Here is a demonstration of the drill.
This should give you a better idea of what a proper impact position feels like and what it take to reproduce this dynamic position.