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Changing from bug disks to the 280mm Corrado disks will not gain much. The brake torque is the mean pad radius (front center of rotation to the radial center of the pad) multiplied by the clamping force. So if you change from a 278 (stock bug) to a 280 rotor, we can assume that the pad radius will basically be the same, and assuming the same piston size on the caliper (means same clamping force), you don't gain much if anything in brake torque. Thicker ventilated disks provide more thermal mass and better cooling, hence less fade. If you use the 48mm calipers then your will increase the front torque significantly.
By increasing your front piston size, you will increase the clamping force. The campling force is the piston area multiplied by the line pressure. So if you assume the same line pressure (a function of master cylinder piston size and pedal force), then larger pistons will give more clamping force.
So, to increase your front to rear braking balance you have to either increase the rear brake torque, or decrease front torque.
To increase torque you can increase: rotor diameter, piston diameter, stickier pads. Vice-versa to decrease torque. Increasing your front rotor size and piston diameter will not help your cause.
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