Im just going to go to assume that you are running a Spekrum system right now? I was running the same (Dx3S) a while back and had a lot of issues with high voltage servoes (Savox). Even with the expernal caps added to the reciever I had issues with brown outs and then actually had a RX go bad on me. It was frustrating... Loved the speed of the Savox with the SC10 so I can't wait to snag the radiopost servos. Just out of curiosity, what is the suggest amount of torque for servoes for 4x?