Here's an excerpt which might help:
Running 100 balls is a frame of mind. You need a high level of skill to do it, and to insinuate anything different is not fair. I'm not saying you are; I'm saying that changing a mindset in a 30-ball runner is not instantly going to make him a 100-ball runner. You need a certain skill set and until you have it, you're not going to run a lot of balls consistently. I am not saying YOU don't have it, mind you; I am talking generically about a 30-ball runner.
That said, back to my original advice. The run should be getting easier as it progresses. Your mindset must be not "I have to keep doing good things to continue the run", but instead, "Something bad is going to have to happen to end this run."
It does not take inordinate amounts of concentration to run this many balls, because most of your shots should be very easy. If in every rack you're forced to take one or two 50% shots, then (math aside) you're probably not going to run 100. You're wasting too much energy focusing on one ball. While at the table, your external focus is on shooting every ball - but your internal focus should be nothing of the kind. Your internal focus should be on keeping your rhythm and feeling the art of what you are creating. It might sound pretentious, but it's not meant to be. Every well-played large run is a thing of beauty; it should not be taken for granted. At the end of the run, you will have a general feeling of satisfaction with what you have done; you won't be thinking "in the third rack, I got really nice position from the 5 to 3." It's no longer about the individual shots... it's about the sum of all the shots together and what they let you create.
As the run progresses, and you are into some high numbers, every succeeding shot should have a difficulty function exactly equal to that individual shot's difficulty. Once the shot becomes more difficult simply because of the number you're on, you're done. You probably won't run another 7 balls once the run itself is making things more difficult.
For me, the shots start becoming more difficult once I'm around the 130-140 range. I have a suspicion that for a player like Blackjack, that number is around the 170-180 range. For Mr. Schmidt, Mr. Hohmann, or Mr. Harriman, who knows, maybe it never happens. You raise this number by consistently getting there and surpassing it.
- Steve