Hope i'm posting in right place .OK i have an 1969 sweet 16 donzi with a 302 holman moody motor and 270 volvo penta outdrive left hand rotation. Here's my problem it came with a 4 blade solas vb27 10 as written on the prop.When i ran the boat it would only run to 4000 rpms at full throttle. i put on a three blade and the boat was uncontrollable at 45 mph and above i tried to trim out the two stabilizers trim tabs but the boat would sort of porpoise the front end. i talked to the lengendary Ron Hill he said he can make me a prop for it at $600 -$700 but don't want to buy one until i find what is the problem with my boat. Also when i bought the boat the previous owner said he thinks the hull was shaved what ever that means any ideas would be helpful