RE: 3-line control systems
I also fly with electronic controls and have flown with everything but the Clancy Arnold system. I currently use the JR radios with DSC and single channel (servo driver) for my airplanes. I have a book available on these systems if you are interested. I don't like 3-line because they only work if you have line tension and can only operate 1 system.
I have currently started to fly Carrier with electronic controls
Fred Cronenwett