After replacing hard tanks and getting ballast up to 3000 lbs, boat will not go over 13 mph at full throttle. Boat will get up to 39 when empty. Figure i need a more aggressive prop, but wanted to see if this is normal. Seems the boat should be able to handle the weight as it is rated at 12 people/2000lbs and stock 1000 lb ballast. If i do go with a new propeller should i get the 1235 or 2079?