i have a world model cap 323-40. its a very nice plane to fly. i have the os 46 ax on it now, but i am thinking about a os 61. i am happy with the speed and power now. it is just short of hovering power [

].
there is a small problem with it. if i give full up elevator at high speed it will spin and twist out of control until i release some pressure on the elevator. i think its flex in the control lines. its a wood rod with 2 metal rods that you have to bend into a Y to hook on to the elevators. then it has one metal rod to go to the servo.
is there any other people that had the same problems with their planes? is so what did you do to fix it?
thanks
Paul