Hey Dave, welcome. I love the 18 cc's!!
On the deck drains maybe you should look into replacing them with ones that have a check valve. The kind that lets water out but not back in. I don't think I'd glass over them...unless they drain into the bilge anyway.
For the 90hp - you might be able to get a different prop to help out with your numbers. Do you know what diameter and pitch prop you have now?
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1994 Wellcraft V21
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