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So, you may have thought of all of this already, but if not...
The increase in pressures on the rear hatch and roof from the little lip spoiler will decrease lift (the upwards component of the resolved force) and decrease drag (the horizontal component of the resolved force on the hatch). The decrease in drag will be very small, however, and probably more than offset by the larger wake.
That's why I ended up going with a spoiler than increased pressures on the hatch without an increase in wake area.
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