I have an 18 ft. Astro bass boat with a 1995 merc 150XR6. It also has a jackplat with a 24 inch 4 blade trophy prop. Speedo says 69-70mph. She chine walks at that speed. If I trim down a touch to 67-68 mph she's straight as a string. I need to know how I can break 70 mph without chine walking. Thanks.
Dave