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As we all know, fluid flow is not very intuitive.
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Quoted for truth.
You could lower your part to the drip-rail and space it back to have an upward-facing opening. Then use a manumometer, or
a homemade equivalent, to compare the pressure on the roof and on the backside.
My problem is that I have trouble getting other people to implement ideas I've had (I operate within constraints). Here is what I would do:
The problem with collapsible boat tails is rigidity and holding shape. This proposal is for a rigid, hinged diffuser hinged above it's lower surface so when it's deployed it reaches forward under the rear valance. No reason it couldn't be a plenum for cooling air into a Coanda nozzle. The superstructure could have inflated tubes or fiberglass rods to define the shape.