As I told before and always said, problem is torque, small servos aren´t powerfull enough. As a rc plane flyer I know perfectly servos and their capabilities.
If you can find a micro servo with 3 or 4 real kilos of torque show me. Anyway servos I´m using are not a lot of bigger than Hitecs 1.8 or 2 kilos, so I prefer 10kilos of torque
And an arduino as controller is cheaper than a transmitter and receiver.
Anyway, this kind of job is always trial and error...