actually takes bias into the equation when desining brake kits. These kits do not only consist of a rotor but also a caliper that is matched to the car. To maitain a good bias aswell as good clamping force.. If you change ONLY to a bigger rotor and do nothing caliper wise then you WILL gt a more frontbiased car. And thats nothing to discuss. Its just how it is. Read up on brakes a bit...