See the Tropfenwagen. The added area is behind the center of pressure, it will act like a tail.
You're departure angle is suitable for off road; not driveways.
I did this study to see about rearward visibility. The cone is the shape of the VW back window* projected from the rear-view mirror out to the boat tail. You can see the unreflected tip ahead of the windshield.
*the big back window, even though the model has an oval/baby window.