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Rick,
The thought just occurred to me that since you have a C&C32, was it perhaps built in Canada? For many years a "de-tuned" version of the Atomic 4 known as the "Stevedore" was sold in Canada. This de-tuning was accomplished via the installation of an orifice about 3/4" ID in the manifold just above the flange where the carb attaches. I saw an image of the orifice arrangement recently but I cannot recall where. Perhaps someone on the Forum has an image.
This orifice effectively reduced the max HP to about 20 as I recall. That would completely explain your engine maxing out at 2100 RPM at 4.5 Knots.
Food For Thought.
Tom
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