According to #7 you have attached flow all down the back window. Instead of a step and flat top, why not a concave curve and eleiminate the step.
There is a race car (I always forget) that used a concave spoon-shaped afterbody to get downforce without a wing.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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