Break-outs
First off, you want to break the balls out on the side where they have the least resistance. That means if you have 1 ball in a cluster of 3, you don't want to have to slam into your 1 ball just to get the other 2 to move out of the way. You're better off just tapping one of the 2 balls to kick your 1 ball free of the cluster.
The only time I use power to break out is if I need to travel around the table or if there is a whole mess of things that needs to be "fixed".
When you can, hit a break-out on the side and glance off the balls to avoid getting stuck. Most of the time I see people get stuck is when they end up going smack dab into the middle of the cluster with regular speed.