To get more distance , try hitting the ball straighter instead of harder. Concentrate on hitting the ball in the sweet spot of the clubface or with a square clubface at impact. If you have ever hit the sweet spot, you know that these shots fly farther than the shots you hit off-center in the heel or the toe.
For every quarter inch you hit the ball outside the sweet spot, you lose up to 10 yards of distance. So for maximum power, improve your swing technique to consistently hit the ball in the center of the clubface.
To be consistent, you should strive to deliver the clubface to the ball square at impact every time.