From your second link: (b) The term unit weight of vanilla beans means, in the case of vanilla beans containing not more than 25 percent moisture, 13.35 ounces of such beans; and, in the case of vanilla beans containing more than 25 percent moisture, it means the weight of such beans equivalent in content of moisture-free vanilla-bean solids to 13.35 ounces of vanilla beans containing 25 percent moisture.

And from the first: the content of vanilla constituent, as defined in §169.3(c), is not less than one unit per gallon.

So 13.35 ounces of beans per gallon, or at least 3.33 ounces per cup. For your 6 ounces, 5+ ounces of beans would be needed for it to be called pure vanilla extract.

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