I do not know the calculation, but I will venture based on experience that the lower-rated vang will be more than adequate for the sailing you describe.
As an example, heres a 1750 SWL vang from Schaeffer recommended for boats 25'-32'.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT
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