This is a timely thread as I was about to post almost the exact same thing. I recently started playing 14.1 to improve my pattern play, touch, and ability to break out clusters. Recently watched John Schmidt's 366 ball run and Mike Sigel's how to run 100 balls on youtube to learn how a pro thinks through a long run.
Unfortunately there are only 7 footers near me and they're all in typical bar condition (dirty, dinged up balls, inconsistent rails, bad cloth, etc.). I've found that I have to hit every break shot with a blast stroke in order to minimize the clutter at the foot of the table and get the balls to separate decently. Balls tend not to break apart very well since they're so dirty; they hardly separate when you bump into clusters. It's also a lot easier to get the cue ball stuck to an object ball when attempting to go into the stack or break out a cluster (again due to the dirty cloth and balls).
I really like the idea of playing 10.1 on a 7 footer instead, gonna have to try that out next practice session.