Does roof pitch affect the performance of the external wind baffle on the ridge vent?

Roof pitch does not affect the performance of the external wind baffle on the ridge vent.

The external wind baffle on the ridge vent performs the same (airflow enhancement and weather protection) regardless of the roof pitch because the external wind baffle is always perpendicular to the roof regardless of the roof pitch. The wind generally will hit a house and run up the roof parallel with the slope (roof pitch), hit the external wind baffle -- which is perpendicular -- and be deflected up and over the external baffle, then over the ridge.