Here's the bug I want to own some day. Actually, I do; but it's just a donor chassis up on jack stands, with two bills of sale and no title.
On the rounded trailing edge—the Morelli tail, from aerohead's album:
This what I thought would work about the time I built that model. When the air encounters a chamfered edge it will follow for a short distance. A V-shaped strip along the leading edge of the curve might do better than a trailing knife edge.
http://www.cruffler.com/Features/JAN-02/trivia-January02.html