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You could also try some airflow modifiers/deflectors on the sides to try to channel some air over the rear window & trunk to see if it helps. You would need to be careful not to make them so large that they added a lot of drag.
Maybe something that looks a little like the vertical slats at the front of the side pods of some F1 cars. The loads on it would be fairly substantial. Perhaps it would be quicker to add a few VGs to the rear pillar (on the sides) to see if they modified the airflow in any useful way.
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