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my understanding is you want a mellow enough tail that gets smaller and smaller while maintaining flow attachment, try to reduce the wake size as much as possible, then detach the flow as fast as possible with hard edges. using small lip spoilers can help recover pressure too when it flips off the trailing edge
look at the mercedez eqxx , the light year zero, and and even a little bit of the vw xl1 car. they all have tear drop rears that then curve up/flatten out for a few inches at the rear for pressure recovery. the original honda insight did not have the mini rear spoiler shapes. it just dropped off. im assuming thats because engineers didnt know as much back at the time of development, and why its drag cd is 0.25 even with a flat bottom and rear fender skirts
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