One of the greatest common mistakes in pool is breaking power and how a break stick will sometimes not destroy and separate a rack well. The real destruction in separating a rack is accuracy and speed if you feel your self tensing up and trying to muscle a cue ball into the rack then you need to step back relax and give aq full stroke. Most people who sue power will tense up and not follow through with a cue shot into the rack. This is why nothing get separated.
A great excercise to just relax and when you fire your shot into the rack is to see where you cue stick extends to. After the break if your cue is not fully extended it probably from your tense cue shot. Relax and think flexible and we guarantee if you have a full stroke you will end up with a separated rack after the break assuming the rack is tight. Not to mention a good Break cue sticks can help incredible a most break cues are also combo jump cues.