What is the proper method of leaning a 165 Franklin? Been doing what the book says and only leaning above 3500 ft., but it feels rich to me at full rich at the lower alltitudes. Was playing this afternoon and found I could pick up about 100 rpm at 2500ft. by pulling the mixture out a bit, it sounded better at that setting, but I don't want to burn anything up. Suppose I should get an egt. Thanks, Rich