While doing some overlay work, I've noticed that the template is actually tilted slightly. The base isn't quite level. The base of the template is tilting up at the rear by about .6 degrees, according to GIMP's measure tool.
Here's the rotated image:
I found the tilt when overlaying the template to a 3rd gen Prius, since I'm using it as inspiration for my Aspire project. I'm thinking if the Prius goes a bit steeper than the template and still manages good flow, maybe I can get away with something similar.
The image of the Prius wasn't level either, but I tweaked the images to work. I didn't make it level, since it was making it look distorted.