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vase,
Agree with notso - that diffuser needs to be at a lesser angle.
Consider venturi ducts, tunnels, if the body shell allows, that rise up from a more forward point between the suspension parts. Lift rises (or rather downforce increases) as the angle increases, but drag is minimised at only 4 degrees (See Katz)
Can you arrange for the front to be really low and for your flat(ish) bottom to rise gently from there, by allowing the rear axle to be higher? That would accelerate the air as the underspace expands, reducing lift as well as drag.
Have you any text books to read on aero?
For an academic text, that teaches you theory but is NOT dry and dusty, try Prof.Katz's "Race Car Aerodynamics" (Bentley), and for a practical text, Simon McBeath's "Competition Car Downforce" (Haynes)
JOhn
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