I have purchased a 1981 smoker craft. It needed a new transom so I am replacing the wood with a micro lam. the transom measures 20in. square to the bottom of the boat but when I put my long shaft johnson on the boat the cavitation plate is 1.75 in. below the bottom of the boat. should I cut the transom higher then the 20 in. to bring my cavitation plate closer to the bottom of the boat? Need Help. Thanks