I hope someone can help. I recently purchased a 2017 Ranger 519 with Yamaha vmax Sho 225 with 33 hours. The prop is Fury 25p, the plugs have holes in them. 10” manual jack plate. The boat has 4 batteries and no power poles. By myself with fishing gear and 1/2 tank of gas boat turns about 5400 max rpms and I’ve got up 67 mph. It might go a bit faster. Hole shot is good rpms are about 3500 to 3800.
Here is my concern, this last trip took 2 family members out additional total weight of 435 lbs people and gear, 3/4 tank of fuel and live well had water in it. Water temp 66 degrees elevation about 800’. The rpms in hole shot stayed the same, however top speed was 50mph and rpms would not go above 4500 no matter how high I trimmed it. I called Ranger they said the prop and the height of the jack plate are correct. I understand reduced speed with weight but why can’t I increase the rpms. Do I need a 4 blade prop or 24p prop when I carry extra weight. Thanks for the help