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Viturro, the Flow Illustrator is just what it says it is, it "Illustrates" what you think the flow should look like. It is explained by its creator as this. It in no way can predict what the flow will look like because it is much too simple for that. You adjust the controls until the flow looks right to you.
Also, Aerohead has said that the foil spoiler will create lift and drag, and not really help in any way make your car more efficient aerodynamically. I think you are assuming the goal is to pack as much air in behind the vehicle as possible to reduce drag, but it is not the goal.
The goal in aerodynamics is to make the air move as little as possible from where it started out. Remember, you are driving through still air, the air passes over the car only because the car is moving....the air was just sitting there before you showed up. So if the air can move over the car with the least amount of disturbance, this will create the lowest drag. The Kamm is really intended to create a smoother transition of air from back of the roof on a sedan down to the trunk area. I'm pretty certain it was never meant to be a fix for the back of a hatchback or wagon without a trunk.
The goal is to let the air return to where it was before you rammed through it as gently as possible, the wing spoiler does not help with this goal.
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