Are you using a racking template? The racks need to be tight to get a consistent break. (More accurately the racks need to be consistent, but the best way to get consistent gaps is to have all zero gaps.)
That answer right there backs up my statement about using racking aids. Poster said no matter how he broke the rack....he couldn't get the balls to pocket or spread like everyone else was doing.....so right away to help this person with his break, the first question he was asked was....DO YOU HAVE A RACKING AID?