Plenty of the guys I run with have carbon hoods, and none appear are as dark as yours in the light of day, cloudy or otherwise.
The vast majority of hoods are heavily laquered as DD points out, so they are highly reflective.
You are exactly right about carbon de-sat and your pattern looks great with the contours.
The problem here is that there is to much of a contrast to that of the paint color on the car.
DJ's example looks a bit closer to reality, in relationship to the color of the car because the sky, cloudy or not, still refects plenty of light.
This is a black car but notice how blue it looks due to reflection.
Just lower the opacity some or maybe adjust the Contrast/Brightness.
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