I don't get your point. The British monarchy had not exerted much control over the colonies. They had been left to develop self-government through an evolutionary process over a period of a century and a half. When the King and Parliament tried to tighten up and exert more control, the Americans revolted. Thus the "American Revolution" was conservative. It was not a case of a people who had been under a powerful absolute monarchy, as in France, suddenly overthrowing that system and trying to fabricating a new one from scratch, and tearing apart traditional all traditional authority, including that of the Church, as in France and Russia. Those were real "revolutions."
If the Founders were "conservatives", how would you categorize those who chose to remain loyal subjects of the Crown?