hello my 70 hp evinrude on the muffs idles around 1700 rpm in the water idles at 1100 rpm and 850-900 in gear is this a problem or normal otherwise it runs great. On my 16 ft starcraft I can turn a stainless 17" pitch prop right to 6100rpm and a 19" pitch to 5900 I know the 19" pitch is the...