My observation, from watching lots of match videos, is that making a ball on the break is the result of certain tables, from a certain side, and under certain moisture conditions. I watched Pagulayan make three out of four, and almost make the other one, against Jose Parica. It was definitely the deciding factor in a close match, as he went eight and out once or twice. They seem to come in bunches. It's there, or it's not, and often from only one side. The rack can be part of the answer. Check it well.
I have seen Corey Deuel wait until the balls are racked, and then inspect the rack, before deciding where to break from. Does he see something? Who knows?