Do some research on vortex generators. The waves put a spin on the air (saw teath in center of the drag wing from pose #8).
I think the vortices form a kind of air curtain bridging the gap and contributing to faster reattachment when reaching the body.
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Look inth aviation vortex generators they alow the air to turn faster than a general curves (template) insted of separation from the backglass being too steep ( in the green zonepost #4)
https://youtu.be/SXwVyxorvno
This guy duse a decent job of explain
https://youtu.be/9Whd_KnsLKE
At about 2:44 he gets into how to get more angle of attack wile maintaining attached flow.
Yes VG s add drag ,however, they prompt reattachment/ prevent sepperation .
I think you will see a massave change in the effectiveness of the spoiler/ wings you have already tested by wsing VG at the top of the rear window like an Evo Mitsubishi
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95Chevy Blazer 4x4 auto 14-18mpg
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