There are flow visualization programs that might answer many of your questions. I'd also think about low-speed water tank testing as a possibility. People also do things like running a model with a fresh coat of paint on it, to see where it dries first, and with paint spots, to see where they run.
However, it sounds as if you are going to brute-force your way on acceleration, so aero drag becomes a minor component, except for the efficiency in downforce.
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