Hi Guys, new to the forum but very experianced with boats, I own and operate Ski Boat Developments, if I can help with boat Q&A let me know. Just a thought for "Quadcam" if your boat lacks power from go you have a prop with to larger dia. The way props work are as follows: a 12 x 15 for example is 12 inch dia. and 15 inch pitch.
You determine the diamiter to set the lift from go, or the punch out of the hole, if you want to get going quicker reduce the diamiter. The pitch is how far the boat should travel each time the prop rotates, this determines or sets the max rev's of the motor.
If your motor is only spinning to 4000 rmp and you want more rev's reduce the pitch. Max desired speed for a 3 Blade prop is 5000 rpm shaft or prop rev's, with a standard prop, special props will give you a bit more. A 2 blade will spin to about 8000 rpm. The weight of the boat and it charecteristics plays a role also, but I have given you the basics, We are on the Murray river near Echuca if you need some help.
Regards, Greg.