What you are describing sounds like a partial kammback. From what I have read, it seems 7 - 10 degrees of turn in is the maximum before the air detaches from the outer edge. It is a well proven way of decreasing the low pressure wake size.
I have been thinking about attaching a dowel to the rear of my car so I can get incremental outward measurements to maybe 4 feet behind the hatch and also make the measurements at gradually faster speeds to see if I can get a good idea of the neg pressure wake zone. Kind of 3D mapping the wake.
My first experiment is going to be trying to infill the wake zone with higher pressure air channeled from under the car. I have not found any literature describing what I want to attempt and from an intuitive standpoint it makes sense to give it a try. Due to the cold weather, right now this project is going to have to wait.
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