Here's an outside thought.

Pick up an isolater from I4C or EDR. Both will RF isolate the servos, switches, and batteries from the receiver. It will also give you the ability to run your receiver on a standard 600ma battery for hours while you use higher rated battery packs for ignition and servo drives. It's your choice if you would want an amplified isolater or not.

The isolater also serves as a high current electrical bus and you will not be able to draw down the drive battery to a point that will cause the receiver to drop out of the loop due to low voltage, provided your using a separate Rx battery.

They're not cheap at around $80.00, but what they do can save an airplane. Especially an airplane using digital servos and a PPM receiver, which can be more susceptable to noise feedback from the servos.

Just a stray thought.

Pat