Sluggish Servo and limited movement problem

I'm hoping to use a servo in our circuit on our robot from
the throttle side of the radio controller but on my transmitter
it is very sluggish and barely moves, the servo moves fine on
other channels and on a different transmitter, is there a setting
I can change? or is the channel on the transmitter faulty?.
Its a futaba 2.4ghz mid range model.

I now think I may have fixed the problem by adjusting the
end travel distance ETD and resetting the trims back to 0.
-the advantages of reading the manual :roll: Doh