The torque amoing GWS NAROSuper will avalible from 2, 3, 4, & 5Kgcm depend on your applications.
Usually, the 5Kg-cm will be considered to be use in flap, break, 3D rudder.
The 2 Kg-cm with 0.036sec is for 3D flight.
The 4 Kg-cm for 400~480 3D helicopters. This had tetsed by a Taiwan's professional demo pilot more than 200+ flights.
Since GWS NAROSuper servos were powered by Asic digital amp, so the holding torque is as good as the world leader brands ( In servo's, GWS is one among of those ).
GWS servo's metal gears were cut by Swiss gear cutting mechines ( This vendor majorly provide gears for Japanese camera companies ). Just like you said: Little to no backlash.
The reason why not had been promote by LHS? I wounder that GWS sell them too cheap?
The MRSP in USA as low as $30 only! So, may be too little profit for dealers to earn margins?
I strongly recomance that you go to your near by favorite LHS to order GWS servos, ask them to stock up for you!