Bob,her are some hard data that may shed some light on the CFD model:

*the original Jaray/Klemperer 'pumpkin seed' wind tunnel model of 1922 registered Cd 0.13.The model is virtually the template out to 65.5 % aft-body,then it takes a dive below 22-degrees,ending at 75 % aft-body.

* Kamm tested a simplistic version of Jaray's pumpkin seed in 1935.This model had zero tumblehome and zero body radiusing at edges.This model had Cd 0.21.

* Kamm's K-form model is the same length as the Jaray but his roofline departs the template at around 17 % of aft-body,arcing down to 25 degrees at rear terminus.This model also scores Cd 0.21.

*Walter Lay's model of 1933 follows the template to 88 % aft-body.This model,while having no tumblehome,does have plan taper beginning at the max camber point.The plan taper boat tail angle is a constant 12.5 degrees all the way to the tip.This model scores Cd 0.12.

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I'm not sure about all the parameters Flow Illustrator will accept,but if there was a way to include any of these features,then we'd have hard numbers with which to compare the results.