not hitting the ball off-center, rather hitting the ball from off-center,i.e. from the left or right side of the table, maybe about a balls width out from the rail and using a rail bridge to control the cue.
In terms of spin, the goal of any break is to control the cue ball through the break, trying to keep the cue ball somewhere in the center of the table.
So, the hit is a stun, to stop the cue ball dead in is tracks after impact.
I have a 4 point goal for breaking, assuming it is a 9ball break, here they are in order of importance:
1)pot a ball
2)control the cue ball so it stays in the middle of the table, this maximises your chances of staying on a ball to stay on the table
3)control the hit so that the 1 ball skids off the side rail and down towards your end of the table, hopefully resting somewhere near a corner pocket. If the 1 ball doesn't go down off the break it's the first ball you're on.
4)pocket the 9 ball :D this one is just icing on the cake, with good power and timing you get a few of these but it's not something to try to specifically do for a consistent break that keeps you on the table.