You can play with this as much as you like. The bottom line is manual brakes + multi piston calipers = no brakes. Wilwood and SSBC are my two least favorite manufacturers for brakes. I love the PBR mustang stuff because it's OE quality and was designed for a car of similar weight/bias as our cars. I understand smaller wheel and tire combos complicate things. If you are dead set on man brakes, go back to a factory combo with an aggressive pad.