I just looked that one up, and it's TOO simple, lol...
There's a balance I'm looking for, and no one's striking it quite right

It needs to fit the angles and curves of the front, but have enough "lip" to be functional. Nothing's fitting the bill: Stillen's is functional but ugly (anyone could make that, technically, and just bolt it to the bottom); Zest's is too steep of an angle, though likely functional because of that as well; and Spreek's is clearly more just looks and probably barely redirects any air at all.
I want to have and eat my damned cake!