Here is where I am on this problem....

Had to replace shaft of motor, runs smooth now.
Bought a new ESC, Eflite 10A Pro Brushless.
When I installed the new ESC and 72Mhz receiver and ran the motor with no propeller, servos do not chatter.
When I install the propeller and run the motor, servos chatter at half throttle.
This is a brushless 370 motor stock from Parkzone.

I have tried all the things with antenna placement, gone outdoors away from lights, Tx antenna up. Servos chatter.

With the 27Mhz radio, all works fine with either speed controller.

This is a Tower Hobbies brand TX/RX but it looks identical to Futaba 4 channel radio.

Any other ideas?

Thanks.