Hi Mike,
Here's the setup
Plane Excite foamy(Zagi look-alike)
ESC Castle Creations Phoenix-25
Motor Super Flying Model Brushless 2 pole 2200-2-3064
Receiver - Futaba PCM Dual Conversion(although I've tried many others)
Layout, the ESC is about 1.5 inches from the receiver

A little experiment that I did was to move the ESC even closer, and I found that I could control the speed of the motor by the proximity of the ESC(Without touching the controls), the foil stopped this effect.

Does any of this help?

Thanks for trying to help

Cheers

Chris