Actually I believe the bike has excellent stoppers. You must use the front brake about 85% and the rear 15% for stops at really aggressive speeds. Note that the dual setup is already ventillated, so unless you want to go wave rotor, there's no exra cooling available regardless of size of rotor. If you want to add more pistons for more pad area, great, but now you're putting the same amount of force over a larger area because the stock master cylinder has only so much volumetric displacement. The stainless braided lines stock put 100% of the braking force available on the pistons, so you don't really gain anything by adding the the extra pad except heat dispapation (reduction of fade) without changing the master cylinder as well. Your best (and cheapest) solution is just learn to use the front brake effectively pre-apex and trail brake the rear for over aggressive moves. Also learn to get back on the throttle early, so you can brake harder late going in to the corner, and be rolling up power on the way out. Until the really tight stuff (90's at 30+) I can keep up with my son-in-law and his buddies on their sport bikes and my brakes are what the factory installed. Too much reliance is put on the rear brake, basically it's decoration when it comes to aggressive riding. My 2 pennies worth.
