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there is something off on your first graph, majorly off
the first cylinder shows a CD of 1.2, the teardrop and the 2nd cyl shows the same, but then the last cyl shows a CD of 0.6
looking at the "wake" pattern flowing behind each object shows no discernible reason for the #1 & #2 cyl object and teardrop to have the same CD, while cyl #3 has a less than CD and a smaller wake behind cyl #3 than behind #1 & #2.
re @ OP
trial and error are going to allow you to find the best combination, but I do agree with what others have posted about it being too far from the actual to make much of a difference, if any, or even the opposite effect.
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~Mike
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