I'm using a Glitch Buster in order to have an 8 volt bus that the extensions plug into. At the end of each elevator extension I place a 6 volt regulator rated at 1.5 amps. On the ailerons and rudder I make a y harness with a regulator at the end of each end of the Y. Each servo plugs directly into a regulator output. The end result is each servo behaves as if it is the only servo plugged into the receiver and you don't have to worry about voltage drop in the long extensions. If a servo stalls or shorts out everything else keeps working and that regulator shuts the high stall current down. The GB also buffers and amplifies the signal pulses.
Jim O