I only adjust the Expo and the brake settings on the radio for the ESC. I never tried the brake curves on the radio im thinking thats the brake expo ? But yea on the brakes depending on what your driving i would use 50% to 60% brake so all four wheels do not lock up.
Do you run a castle ESC/Motor ? If so using negative expo seems to really help make it smoother if you have to much lets say a shot gun type of torque.