I suppose I might start a new thread for this question, but this seems close enough:
When placing the stickers, did you try to make them parallel to the ground, or parallel to the closest body line/seam? Or some third method? I'm planning mine out, and it seems natural to make the straight line parallel to the seam between body panel and black plastic bumper, but when I step back (I'm taping on copies to test), it bugs me that they look tilted.