Hi, I have a 1966 6 hp evinrude motor on a 11 ft Achilles raft and it doesn't get the raft to plane out. The motor is in great shape and has a 2 blade prop. My question is if I change to a 3 blade prop will it a give a little bit more power to get the raft on plane? I can only find info on 3 to 4 blade props which doesn't help me thanks