ATL is the adjustment to soften braking.
On my Castle equipped electrics I either use the default of 50% or set it to 75 in the ESC depending on the car. Then with the 3PKS ATL set to "100" and throttle EPA set to 100 forward and rev I calibrate the ESC to the radio.
Once this done I lower the ATL between 95 to 75 depending on the car to get the brakes perfect. I usually only use ABS for cars with mechanical brakes.