the purchase of a new set of CCW classics made it necessary to upgrade my old (1 yr.) 10.75" wilwood dynalite pro 4 piston (1.75") front brakes to the 12.91" sl6 setup. my back of the car has 12.19" dynalite pro 4 piston (1.38") setup. what im considering is to swap the old front 1.75" calipers for the rear 1.38" calipers, or, i just saw a retro 6 piston caliper kit that lets you use all your old kit but adds the good caliper. the rest of the system is a wilwood 1" tandem aluminum master cylinder and proportioning valve. what would be the best setup?