Sorry Frank, but there is some truth to what Max has to say, sometimes (Not Always) it is better to raise the entire height of the spoiler while staying flat to reach the "curve". Having a screwed up small wake can be worse than a big well-mannered wake. The Audi A2 is a good example of a fairly large well organized wake that has a very low Cd on a car.
I think Mauricio would be well served to raise his up a few inches to meet the curve sooner. Maybe a bit larger "Wake Area" but I think it will be easier to build and live with, and the wake area will still be "calmer" than currently.
If he really wanted to do this right, he'd make a Kamm.
Oh, and I agree with you, that hydrogen powered Salt Flats Ford Fusion Special has very little to no elevation added on.