I figured both this and the rad were dead issues. With 500 hours of development I assume you have it worked out but I am not aware of a modern sports racer that draws intake air from the bottom so "agree to disagree" is in play and it has worked for thousands of years.
My Mustang has the inter-cooler HE mounted at the bottom and without boxing, larger heat exchanger, dual fans, and manual switch we could not keep it cool. The ECU would pull timing and spoil the day. The air cleaner is boxed in the front fender and I pull air
from the bottom thru the factory brake duct opening in the bumper cover. The last time I ran it, ambient was 95 and IAT1 would run as high as 118. It did not shut down, so we have made significant progress, but I am going to move the air intake to the head light or use a NACA duct on top of the fender next year.
One should keep in mind when Smiths books were written - to imply his work is not based in empirical data is simply not right. Katz, McBeath, and Stainforth all use emperical data, but are much more current publications.
The high down force configuration. I am interested in its integration to your bottom and front clip.
Morris built a full aero rocket, but was sent away
x-chr