I just got done putting a blower on my 21ft. Howard v-drive,the motor is a 468 cu.in.the blower is just a 174,the motor should have around 450 to 500hp. My question is when I recently took it out to test drive it, I ran 69 mph, hitting the rev. limiter at 5900 rpm, im turning a 13,14 prop, should I regear it or get a bigger prop or just have the prop I have reworked?