It sounds like you were attempting an aileron roll vice a barrel roll. Aileron rolls stay nice and flat in a straight line as the aircraft rolls through. A barrel roll looks way different in that the aircraft looks more like its spiraling the attempt is to keep a 1 g load on the aircraft through the maneuver. Not sure how to measure it in RC but A barrel roll uses all the surfaces to make a more spiral looking roll while the aileron roll uses the surfaces to have the aircraft roll in a nice straight and flat line. I do aileron rolls in precision aerobatics. I do barrel rolls in warbirds.