LOVE these posts.
Bar table eight ball APA style at SL5 and below usually involves a guy committing a failed runout, game after game. Many SL6 shooters shoot no better than your SL5s, but know how to close, how to win. These are the guys who are tough to beat, and we know who they are.
If you can use some of basic principles (Phil Cappelle's Play your Best Eight Ball comes to mind) people are describing, you can beat a large portion of eight ball players with a little forethought and planning, regardless of their shooting ability, to a point, of course.
As was said, your typical eight ball break on a bar table has two or three clusters, shadow balls, or blocked pockets. Even top flight pros can't break out of all of these consistently, every time. Even the top guys will duck for cover and play a safe rather than risk a low percentage cluster break.
This is why I LOVE eight ball; there is so much to think about, so many paths, patterns, and the outcome is almost always in question until the eight ball is sank.
IMO there is nothing better than watching two master technicians on a bar table shooting eight ball, IMO.