Loose-ball bottom bracket adjustment
Let's suppose, just hypothetically, that a particular loose-ball bottom bracket just doesn't seem to want to hit the sweet spot where it rotates with absolutely perfect smoothness AND the cranks have absolutely zero perceptible play. Would you adjust (a) very slightly tight, with a tiny bit of roughness when rotating, or (b) very slightly loose, with a tiny bit of play detectable when pushing a pedal to the right or left, or (c) keep re-adjusting because every BB can always find the sweet spot?