If that's your true percentage, there should be nothing stopping you from running 100 fairly frequently. That is, if you get to 20 from an open position 80% of the time, you should get to 40 64% of the time, and so on. The only thing that might hold you back would be a mental barrier when you get into uncharted territory.
Bob, I agree. If Cessna10 is accurate with what he is claiming, there's no reason he hasn't yet run 100 balls, and he would certainly be considered among the higher levels of amateur 14.1 players, and could potentially hang with a pro level 14.1 player in a straight pool match to 100 or 150.
My high run is 98 on a 4-3/4" pocket 9-foot table, obtained nearly 20 years ago - I'm currently 62 year's old. I've rarely reached even a 50 ball run in the past 5+ years despite numerous frustrating attempts, although I realize that my chances are considerably hindered by limiting these 14.1 practice sessions to a 4-1/4" pocket table.
I would say when I'm practicing 14.1 and I set up an ideal break shot to start each run, realistically no more than 20% of the time can I get through the first rack with an ideal break shot set up to get in to the next rack, with a 20% chance for each successive rack. That computes to my chances of getting through 2 consecutive racks at any given time at 4%, the chances of getting through 3 racks (42 ball run) drops to less than 1%, etc, etc.
Probabilities tell me that based on the accuracy of those 20% odds to run a full rack and set up an ideal break ball, my chances of ever running 100 balls (7+ racks) is roughly 1 time in 8000 attempts. Even I'm able to increase my odds of running any given rack from the start from 20% up to 30%, my chances of ever running 100 balls (7+ racks), would still be less than 1 out of every 500 attempts. So realistically, I guess I need to start facing the grim reality that I'll never achieve my goal of a 100 ball run!