Usually, putting the cleats all the way back in the slots is good enough; but once or twice I've used my Dremel to elongate the slots and move the cleats a quarter-inch further back. I think the proper position for recumbent riders is just *behind* the ball, and moving the cleat too far back can affect the smoothness of your pedal circles. Like any other adjustment like seat angle and crank length, though, the recommendations are only a starting point. What feels good always trumps 'rule-of-thumb.'