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Could we please stop using "laminar flow" where we mean "attached flow" and "kammback" for "roof extension?" We only make things difficult for newcomers, especially those with a little knowledge, if we develop a new jargon here.
If a panel bulges at speed, a pressure difference has built up. We don't really need to decide if the high pressure or the low pressure is the "problem" area. In general, the panel is there to separate pressure zones, and requires appropriate stiffness.
I think that load-levelling arrangements on the chassis will be easier and more productive than adaptive aerodynamics. It is possible to get a drag reduction by "sailing" in crosswinds even with a rigid, fixed shape, and still have the shape stall and go into high-drag mode if the side force becomes a problem. Such tricks are only worthwhile with a limited speed range and good traction, though.
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