Are you using the polynomial equation to validate the spreadsheet or supplant it? I'm not expert in this but consider a B-spline curve instead,
https://www.google.com/search?hl=en&...B-spline+curve
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There was a few conflicting templates on the 20% mark, some had 5.5*, when I charted this it had a hump there and the 7.5* gave a smooth curve so I think the 7.5 is the right figure, can anyone confirm this?
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I believe this had been noted before.
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The third thing was the underside/diffuser, I have seen anything from 2% to 11%, read a few explanations, but still not quite sure what angle applies in what situation
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I can't find the illustration, but the angle is dependent on the form of the afterbody—box, fastback or hatchback, or notchback. Those may be in correct order from 0° to 11°.