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To me it looks rather short. I know you want to open your trunk, can you make a seem and have the Kammback hinge up with the trunk lid? It also looks like the transition from sides to the top is rather sharp. This might be causing some issues.
What is the angle from the roof to the back of the trunk? you might be making your wake longer with the Kammback (the air leaves at a shorter angle).
A thought on you testing, can you come to a complete stop? Like cost from the hill to where you stop. On my testing I could not make a good comparison until my speed was down to about 10MPH (but the real data was the differences in total coast length).
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