What your trying to accomplish is running your motor at the best rpm (which is between 5200 and 5500 rpm ) and get the highest speed / average weight on your boat.
My pitch was 17 on my skiff. I bounced between a 15 1/2, 4 blade stelleto ss prop (which I got 38 mph) to my 17 pitch 3 blade aluminum prop. I stuck with my aluminum prop because I flats fished in very shallow areas.
ALSO, VERY IMPORTANT If this is your first carolina skiff it would be in your best intrest to make a change to your trailor if it has not already been done. Change your front bumper to this like in my picture. If you don't one day you will catch the front end on the bumper and break the front off on your boat.