I have been trying for 2 years to adjust my prop, jackplate, etc. I have never been able to get my speed over 69 (one person with little fuel). If I have 2 adults with gas tanks full and live well full, I can only get 65. I have a 99 Cougar DC. I heard that the 98 & 99 Optimax motors had different exhausts and caused the restrictions. Does anyone out there have my same setup with a 98 or 99? Ryan 901-461-4740