I purchased a Bullet 22Sf flats boat. I am having a hard time getting the boat tonrun slower than 40. There are a lot of areas with slow speed zones that infish in and the boat wants to porpoise bad at anything under 36 or so. Would a smaller pitch 5 blade prop give the boat more stability at lower speeds? I have a 250 Pro XS on it now. Thanks for any input you might have.