Soft proofing and Out of Gamut warning

I like to use Blurb for a perfect photo book. I am an amateur photographer but like the most of my pictures on paper.
What's the perfect workflow for soft proofing ?
A friend of me has calibrated my screen (Thunderbolt Apple screen).
My current methode :
I take a picture in RAW with AdobeRGB profile setting, i adjust a few parameters in Lightroom and then go to Photoshop and start de soft proofing with the Blurb-ICC profile.
The result with soft proofing is like there's a white mist over the picture. Then i try to optimize this with various parameters.
When i try the soft proofing with the Blurb ICC profile + out of Gamut warning option .... there are many colors out of gamut .
My second methode :
When i import the raw picture in photoshop cc and i convert the picture to the Blurb profile, then there are no out of gamut colors but everything is in CMYK.
Is this a good way for perfect photo books in Blurb ?
Or must i ignore the out of gamut colors ?
Is it better to make my pictures in sRGB ?
When i want to save the end result in Photoshop cc ( jpeg for Blurb )  must i enclose the Blurb ICC (when in CMYK) , Adobe RGB or sRGB profile (when in RGB)  ?
Please help me make a perfect photobook 
Mario

Since I don't know what "Blurb" is, I'm going to assume that's your printing service somewhere, and that they have provided you with their target printer profile.
What you describe under current method is absolutely normal, expected behavior.  Adobe RGB simply is a much larger color space than whatever this Blurb profile is.
If you care to let me know how or where I can get a hold of this Blurb profile, I can in a matter of seconds prepare an illustration of how the two profiles compare to each other.  From where I sit, it would appear you're throwing away a lot of image quality by using Blurb.
There are two wacky ways of getting around your seeing the out of gamut warnings.  The first is not to soft-proof at all. (Duh!  )  The other one is an unorthodox workflow which works just fine PROVIDED you are aware that the image files as an end product are only good for Blurb and for no other purpose, and that is to set your WORKING COLOR SPACE from the get go to the Blurb profile.  Of course that is not the recommended or even kosher workflow.  It is only a workaround to the deficiencies of this Blurb profile.
I cannot comment on your "second method" until I know more about this Blurb phenomenon.  If they print on a CMYK press, then they are throwing away a lot of colors, even if you send them images in sRGB.  Nothing you can do about that.
The one thing I can say is that if the outfit doing the printing is the one that sent you the profile, then they will know how to deal with an sRGB file.  The profile they sent you is just what their printing process uses.  No need to attach a copy of their own profile. 

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