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I think the goal should be minimizing the gap between the tire & the skirt. I think by definition, that means you may not be able to build in a tear drop shape.
On my car, I intentionally avoided rounding the skirt back towards the bumper cover at the aft end of the arch. Instead, it joins the rear mud flap. My thinking there was clean separation at the end of the skirt was best.
When I tested the skirts on the Camry hybrid & Corolla, I used the rear mud flap in both cases for aft fastening (OK, duct tape) and then I also "faired" from that point aft to the bumper cover (cardboard). That additional fairing in addition to the skirts provided the best results on both cars.
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