You never know. My Mainship Pilot 34 has a squared off deadwood somewhat similar to what is shown above but the keel is tapered below the prop. Take a look at the before pic below. I do experience cavitation sounds particularly at wot and I hoped for a little performance boost. So I decided to fair the deadwood. See the second pic taken before final painting.
It did no good for performance and the cavitation sounds are still there. But it didn't do any harm, except to my wallet.
David
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