Page 63 of the manual. VR Adjust menu.
I have no personal experience what effect this will have on an esc.
I Had a brand new unit that I could not program the fail safe for the throttle servo.
Found this VR Adjustment way off for both steering and throttle.
Set it up per the manual and automagically everything worked as it should.
Since then I have checked every radio in front of the customer when new out of the box.
They have been all over the place.