One of the things I have my students do is this:
1) Never sacrifice accuracy for power
2) Perform the transfer of energy from stroke - to cue ball - to rack
3) Start out at 50% break power and gradually increase to see where you get your best results
Never sacrifice power for accuracy
Power is not all that important on the break. Accuracy is! Over a period of time, you will see that a ball is more likely to drop on the break by being more accurate (as opposed to being more powerful).
I believe that the less that's flying around the table, the better chances I have of a ball dropping into the pockets. The Big Bang Theory of nine ball has always puzzled me. I would rather know exactly where my cue ball is going, and exactly where the one ball is going. This way I know I will have a shot when something drops.
How many times have you made a ball on the break only to get stuck rolling out or to be left with no shot at all? How many times have you had your cue ball fly around the table hitting other balls after you contact the 1 ball? How many times have you scratched because of that?
It's okay to exercise a bit of power as long as you use only the amount of power you can control.
Accuracy is exactness. Repeat that statement over and over in your head just before you break the balls.
Transfer of energy
The tip should stroke the cue ball accurately so that the cue ball can can be directed and guided to make contact with the one ball
accurately. Anything less than accurate will create problems for you. Above all else, remember that.
You need to transfer the energy of your stroke to the cue ball. The cue ball should transfer
all of that energy into the rack. If the cue ball is still flying around the table, you did not transfer the energy properly, or you did not accurately contact the 1 ball properly.
When we try to HIT the rack as hard as we can, we tend to come off the cue ball, or to come off the 1 ball. This means you don't stroke the cue ball where you want - or if your cue is not level, you have a bouncing or flying cue ball ball going towards the rack. Nothing good ever happens when you do that.
STROKE the break shot, don't BLAST it or HIT it
I recommend that you stroke the shot just as you would with any other shot. Shoot it like a stop shot, and have the cue ball sliding until it contacts the one. Test this out at 50% speed - pay attention to your accuracy - and I guarantee you that you will be amazed at the results.This is NOT the soft break at all. This is a controlled shot - at 50% of your total breaking power.
After you see how well this works, you can increase your stroke power gradually, but pay attention to the results you are getting at various speeds. Most players I have worked with get the best results by using 50-65% of their power. Imagine that!
Using all of our strength is useless
When we muster all of the strength in our shooting arm to blast away at the rack, we tend to tense up. When we tense up, our shooting arm becomes tight and our stroke's fluidity gives way to rigidity. You end up blasting the rack and hoping for something to drop, and usually the only thing that drops is your ass in the chair after you hand your opponent the cue ball.
Only use the amount of power that you can control. You wouldn't want to water the plants in your house with a fire hose, would you? It's too much force and power that is necessary to complete the task at hand. It's overkill. It's the same thing with the break.
Like I said to you in the PM I sent you - if you have any other questions - give me a phone call.