Bear down on your break. It is super important to focus on the spot on the object ball so as to park the cue all. Parking the white rock usually means a solid strike.
The one thing I will say about the break, is that I don't understand the correlation between the power and the quality of someones break. I thought that Corey already proved that you don't have the smash the bejesus out of every rack to have a great break. Everyone who plays with me even semi-regularly, comments on how well I break the balls. I don't smash racks. I hit my 10 ball break between 70-80% power, pocket either or both of the balls behind the head ball, and play shape for the 1 in either the bottom right corner or the side pocket (depending upon the table).
I don't think you have to hit the break hard to be a good breaker. In fact, I think the opposite is true for most people. I think most people's breaks are inconsistent because they try to hit them too hard.
Harvey Penick was a legendary golf instructor. One of the greatest to ever live. He said that 85% was the perfect number. If you swing the club at 85%, your rhythm and timing will be perfect, and as a result, you most often will actually hit the ball further than you would swinging at 100% because you will strike the dead center of the clubface more consistently. He said that 85% also gives your body enough time to subconsciously correct on the downswing any flaws you may have on the backswing.
I firmly believe that same idea translates from golf to pool, especially on the break.
Hitting them harder doesn't always make more balls, in fact, sometimes I think the velocity will prevent balls from going into the pockets.
This is what I had to say in a different thread on the same topic.