Yes, Fred you are on the right track and the plot should look like an ellipse. If your control surface (in this case a fin) is not stiff enough (K_theta) and starts to couple with the control loop frequency (K_alpha) that turns the fin, you could end up in this region. I am going back through right now trying to decipher what you have done. Thanks and maybe I can get this knocked out with a little more digging.
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