RE: rolls not axial
My suggestions only, based on experience with your problems, several years ago. Move the CG forward if you can, the further forward the better. Then on low rate switch, reduce the elevator and rudder expo's, and reduce the elevator, aileron and elevator throw to give you a better locked in feeling, like a pattern plane. Finally, make sure your throttle curve is linear. JR 10X and 9303 have a very nice throttle curve feature for this. That way it will not drop if you move the trottle a little. I only put enough rudder throw in low rate for barely holding knife edge at full deflection, for reference.