Hi,
please connect a servo instead of the ESC and check that it moves properly, when you switch the banks/head speeds.
Did you set any limits in the radio, for the output signal, like ESC Endpoints, see
http://www.vstabi.info/en/node/1679?
If the servo moves between 40, 70, 100 the radio is outputting the individual pulses properly, and it more or less must be with the programming of the ESC.
Does the ESC reach full throttle?
My first guesses would be endpoints in the ESC or maybe a stored head speed, or a limit or programming which is set too high for the calculated drive, or simplest things last, a battery not fully charged
Best,
Eddi
Born to fly ...
forced to work.