Athos, if you drive with the blind open then you can see many 'holes' to the outside so it's hardly surprising you get some noise. As a perfectionist, I tend to agree that the noise from the front could be resolved. The problem is it takes two people to locate the noisy area and you also need to be travelling at constant high speed. If you find a solution then please let us know.
If you close the blind completely then the noise stops so it doesn't bother me that much.
Have you also noticed that if the sky-roof is open at position 2 then it's actually quite a bit noisier than at position 3 (or for that matter fully open) ?