You need to use the blue and white wire because the dimming out of the light is controlled by the BCM through the ground, if you tap into the fuse link you will have a constant on situation unless you tie the ground wire into the blue and white wire. The blue and white wire is actually a ground wire.
I'm about to add some of these also. Is the blue and white wire in the BCM harness also? I'm not spotting it in any of the pictures. Also is it blue with white strip or white with Blue strip. I'm assuming it's the first of the two since you said it "blue and white". Correct?
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