As a flat rate technician at a dealership, it is your responsibility to negotiate the best terms possible for your services.
Since we don't pay for product you should be in the $100.00 + range to install hood/fenders/mirrors and the same for a bumper.
Depending on your experience of course.
The reason is called light refraction. The tint bends around the defroster lines causing a distortion that the light *refracts* off of due to the uneven surface.
No, you can't do anything about it.