Ferrari
See if you can find an image of Ferrari's 599 XX car.It has C-pillar buttress winglets which help get air onto the rear spoiler with minimum drag.
They spent a couple hundred hours in the wind tunnel ( $2oo,ooo) to dial them in.They would be an example of current-think which actually performs.
You're going down a lonely path.There's very little literature on such things.Good luck!
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