FWIW, Like Ken I found the servo lead connections to my King Tech ECU to be very loose. One thing I have done (starting with my helis, which have high G, loads years ago) is run a bead or blob of hot melt glue along the ECU case top and servo type plugs. Don't get it into the case! It just holds everything together and is easily peeled off for service. It's nice that the KT ECU is metal cased because that trick can damage the stickers on some case tops.