Nick, Im currently using wilwood 6piston all around with 13" stoptech full floating rotors all around. To get the right feel and balance I played with the master cylinder sizes and settled on 7/8" front master, 1" rear master.

When I was messing with brakes and trying to fix my pad knock back issues, I had tried the 2 piston floating stock mustang calipers up front and in rear and there was a braking difference for sure between wilwoods and stock stuff, I found wilwoods I could break deeper and more consistent then stocks, much better pedal feel and bite.