It turns out that the assumption of radial symmetry is absolutely pervasive in our CP calculations. Looking at FinSetCalc.calculateNonAxialForces(), we don't actually compute the CP of a fin -- we calculate its X value, and pin it to Y=Z=0.
The only exception to this is in BarrowmanCalculator.calculateNonAxialForces(), where the pinning only takes place if there are three or more fins in a FinSet. If we remove the test for number of fins in the FinSet, we are in essence making the assumption that there are more fins *somewhere* which will end up being radially symmetric.
f0e5902e00