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Some car’s chin spoilers/air dam/front deflector/whatever you call it are higher in the center lower by the sides near the wheels, acting as a tire spat. You mentioned you already had a front under tray and relatively smooth car bottom, what is the height of that under tray relative to where you are wanting to place that deflector? Conventional thinking for low drag (without a wind tunnel for testing) is that a front air dam doesn’t need to go lower than the lowest point on a car, several examples on here of too aggressive air dams adding drag and needing trimmed. On the tire spats, look at oem spats and you will notice how far towards the center of the car they are, because the airflow in that area is angled pretty heavily, aka don’t put them right in front of the tire.
I would also note that the OEM’s are focusing on a lot of different things, and I am sure the engineers at both companies are focusing on the whole car, however they also have to balance in things like style and cost of manufacture. Use ideas from the best of both, it isn’t that one strategy is better than the other.
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