Check your rudder before adjusting the ailerons. If the rudder is out of trim, it will try to roll the plane. It doesn't take much either. I discovered this when I had to fight my trainer when the instructor turned it over to me. It wanted to roll way off to one side. We landed and checked trim from trainer to main transmitter and there was not difference, back in the air and the same thing. I happened to notice the rudder trim on the trainer box was pushed full in one direction. I popped it back to center and problem sloved. Once the plane was back on the ground, I checked to see just how much rudder was being applied and found the full trim on the trainer box would only give about 1/8" deflection on the rudder. That was enough to roll the plane over though.

Don