Keep in mind: As you're aware, the numbers you are quoting are CARB numbers, essentially registration information that was provided with the Emissions Certifications for the specific engine model.
Those numbers would most commonly come from an engine running in a controlled environment, and often do not show outputs at the maximum RPM's of the engine. This is why the constant "quoting" of CARB report numbers is becoming a problem (much the same as the quoting of 3rd and 4th party "weight discrepancy" stories).
While this isn't the Mercury Forums- it's good to note that it's been an ongoing problem there.