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A partial Kamm back - to the leading edge of the trunk - 11° rake.
Cd 0.343 +16 counts
Fz 428 N -9 N
Not useful imo.
A full Kamm back, 11° rake:
Cd 0.333 +6 counts
Fz 353 N -84 N
It reduces vortex drag (shown by lower lift), and increases form drag. The dominant vortex in the car's wake is very interesting.
Certainly following the real car's taper, I would expect a better result than 0.333. It doesn't look promising atm, and I'd lose the use of my trunk. I will try another few variations just for curiosity's sake.
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