If you move the calipers outward, you've got to decrease the bore of the pistons, otherwise you start fucking around with the ABS computer's notions of how and when your car should stop.
Shorter stopping distances should not be your goal, repeatability should be. If you want shorter stopping distances, your best route is a good set of pads and tires. If you want repeatability, start shopping for a real BBK, like Stoptech or Brembo.
Your powers are useless! I'm wearing my tinfoil underwear!