there should be a setting on your controller that allows you to change the sensitivity/speed of the servos, youd have to look in the instruction manual as i cant rember what the setting is called without getting mine out
could also be your EPA (End Point adjustment)for your braking, when you apply your brake does it move same distance as applying throttle? just to try and narrow things down for you
and as deluge said could be your abs, when you apply your brake does the servo slightly twitch when it reachs the epa?
just looked a little about your controller and i see it does have "servo speed" setting on it, id start there
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