If you can measure the pedal ratio, that would certainly be helpful information to know. There are a couple of ways to increase brake torque without upgrading to larger rotors and/or calipers, but if you wanted to assume that it's the pedal ratio that is lacking, you could always decrease the MC bore size to generate more pressure at the calipers relative to pedal input.
What pads are you running? Increasing the coefficient of friction of the pads is another good way to increase brake torque, but it comes with a price. You'll eat rotors much faster and get to deal with dust and noise that comes with the higher coefficient of friction, so not necessarily ideal for a street car. I've run some Napa pads in the past that felt like glass on the rotors...easily the worst stopping, longest lasting pads I've ever run on anything (and I'm ashamed to have run them as long as I did).
Tobin
KORE3
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