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As far as downforce, i think a diffuser is your best bet. if i recall correctly from a video i watched on the topic, the downforce from a diffuser will be centered on the the point where it starts to curve, so keep that in mind and design accordingly.
and as was already stated, keep frontal area as low as possible. also, if the area of the cross-section changes rapidly that causes drag, so if one part needs to stick out weirdly, have something else dip in at the same point in the length of the car. (it sounds weird, but that is actually why the bubble on the top of a 747-400 is longer than earlier models).
*suddenly sees more replies and no longer knows if i have anything worthwhile to say...*
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