Hi Guys,
I always use carb heat when on the ground, often in the air and for a short while at cruise power before I pull the power back in the decent, then all the way in - I've never had a problem.
Mono - are you using a metal or wooden prop? I have found a really marked difference in throttle response with an A65 when fitted with a metal prop - On my old Taylorcraft it was easy to make the motor falter if the throttle was advanced too quickly, my Cub with a light ash prop is much more immediate.
Regards
Kingy