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Is it identical to the old rudder as far as you can 'see'?

If Catalina modifed/increased the balance area of the newer rudder the propwash might hit that in a way that tends to push the rudder out of line when you release the wheel.

If the shaft location vis-a-vis the blade is further aft than the original it might be as simple as that. While a slightly 'overbalanced' rudder is very light under sail, under power the propwash can really work on it that way.
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