To eliminate them as possibilities I'd check the timing and centrifugal advance operation. No way a 12x7 is seriously overpropped. You should get 2000 RPM in forward all day long with a 12x7.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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