Bernoulli and 350 ft/s, 146 cfm/in²
I'm definitely no expert here but i believe you're trying to compare apples to oranges.
From your first post.."That's how velocities in certain areas of the port can exceed 350.3 average." "Certain areas" of the port are local velocities not average. Using your pitot probe at the curtain area you're measuring the local velocity. Great job on all the math