For me the key is relaxing. If I can relax and not worry so damn much if the ball is going to leave the PF... I play SO much better. Many of these slow speed techniques near the flippers are really just about moving the ball about where you want it to go so you can take your next shot. I am starting to practice more games with a more patient and accepting attitude. I am not sure that this necessarily leads to higher scores, but it certainly leads to less stressful games (which is a big plus when playing tournament games).
Watch Keith Elwin win PAPA games relaxing on one leg. He does it all the time and makes it look easy. Jorgen Holm plays a very easy looking game as well, and he's f'n death on wheels in front of a pinball table.