Okay, I put tufts on it today, attempted to videotape but I couldn't figure out how to hold the camera still for my life (besides it's not safe to be staring at my phone while driving) so I will enlist some help tomorrow if it's not raining.
The placement of the tufts was done in a manner that would allow me to see the ones on the side through the side mirror and the ones on the rear bumper through the rear window (but not the rearview mirror). I know there is a giant bubble of separated air on the back so there's no point in putting tufts there.
I did go for a little drive and noticed a handful of things.
First of all, I placed one yarn tuft near the top of the side scoop, and it seemed to be flapping in the wind, so perhaps the intake isn't super aerodynamically clean. Oh well, nothing I can do about that.
Second was that the tufts along the side of the car at the end were all wrapping towards the center of the car, and the tufts on the softtop were wrapping steeply upward along the surface of the top. I'm guessing there is a big vortex that's doing that.