when you break out a cluster you should know what the result is going to be and be pretty sure youre going to have a shot when you are done otherwise you should leave it alone. if you just hope for the best and bust it up then you are just relying on luck and if you dont get the result you want then it was a bad shot and you can only blame yourself. watch as clusters are broken up in a long 14.1 run. no luck. just skill. as for the break i have seen pros time out very consistant breaks and when you havent found the spot its time to use your skill to make an adjustment. again no luck involved.
brian