From what I understood, you want to create a diffusor, but as you said you don't have much space up (the chassis is right there), you want to increase the area by going wide.
But the idea is to make the upper and under parts of the body be as close as possible at the rear, so the vortices will be weaker, thus less drag. Just as if your whole bodywork was an airfoil.
Just check the LeMans prototypes so you can understand of what I'm talking.
http://www.infoscourse.org/2006_ALMS/Po ... der_00.jpg
Also, I don't quite get how you would make it wider, as the tyres are right there too.
The flat underbody seems good.
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