There is another way of improving midrange throttle response/ sensitivity....use the throttle curve function in your radio and elevate the midpoints on the curve so you create a more linear feel with thrust. This very much improved the feel on the low end and midrange of the throttle on an old 120 I have in an f18 which is often where the turbine feels laggy.
just a thought that does not cost a cent. ....give it a try. You might be pleasantly surprised.