"Bigger" and "smaller" wakes don't really matter, it's the measured turbulence, which... you have to measure through trial and error or CFD.
Smaller wakes can create more turbulence than big wakes depending on the resulting flow of the air, but you can't really argue over because there isn't any evidence lol
As far as the Fusion goes, I see that the back end of the spoiler certainly matches up with the face of the trunk, but to my eye, it sure seems like the beginning of the spoiler is raised a bit (maybe less than an inch), and I only say this because if they did raise it an inch at the beginning, they did it for a reason. But it is no matter anymore.