I think you are going overboard on the aileron thing. I'm hoping ken gets in here with a drawing because you are making it a lot harder than it is. All you need is one servo in each wing and about a 4 inch push rod from each to each control horn from each servo output horn. Don't need no stinking bellcranks or tubes!!!!!!!

As for the radio, make sure the batteries are fully charged. transmitter output mode matches the RX mode PPM/PCM/FM. RX and TX antenna fully deployed but not right next to each other. Too close and the RX gets TOO MUCH signal