One other thing I've noticed about the RH,on both my U-Can-Do and X100 its the rudder that "kicks" in the roll. I hold the ail to the limit but if I dont use rudder to the limit ,the RH is not as axial and doesnt seem to have that "snap" at the beginning of each roll. Come to think of it,my rolling harriers do not have a constant roll rate,they do seem to hesitate a little before the rudder kicks the wing over.