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I think I would try to make it more parabolic... but coroplast is not exactly the ideal thing to be working with for complex shapes...
I think I understand what you are saying... to paraphrase:
I should be trying to get the lower Cd of .38 for the "hemispherical cup" rather than the .42 for the "hemisphere" by possibly extending the trailing edge beyond the end of the mirror.
An improvement on this would be to taper the over-extension to start a boat tail. I haven't gotten around to trying to quantify my results. These aren't super hard to take off or put on, but I really don't want to try doing a-b-a testing until I have two of them in place that I am happy with.
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