All the small Continentals A-65/75/85/O-200 are more prone to carb icing than their Lycoming cousins. It's down to the location of the carb as I understand it. I thought it was acceptable to apply partial carb heat for cruise settings preferably accompanied by a carb ice / temperature gauge.
I used to apply carb heat every 10-15 minutes or so when I had a Continental engine in front. Seemed to keep the carb ice at bay. I don't know why your engine seems more prone Whirl. Maybe it's time to whisper sweet nothings at your pet engineer
