SRGB or Blurb icc profile better for soft proofing prior to Book module?

As I understand it images destined for Blurb are converted by the Lr engine into sRGB behind the scenes. To achieve best chance of colour accuracy in the finished Blurb book, is it better to softproof using a sRGB profile or the icc profile* offered on the Blurb Support website. On the surface this icc profile is recommended (by them) for their Booksmart process. Anyone know if that is similar to the Lr Book module process? There is no mention of Lr anywhere on the Blurb color management pages.
It would be great to pin down the answer to this. I cannot find any recommendation for best work practice aimed at getting good colour reproduction in these books; and trial and error, whilst acceptable in making inkjet prints, is a very expensive route when applied to printing a Blurb book.
* And even then, as far as I can see, there is no method for differentiating between the Blurb papers. It is just one profile to fit all.

I tried using 'Export Book to PDF' in the LR Book module with 'Book' set to 'Blurb' and the PDF images are all tagged as sRGB profile and 8-bit color.
SUGGESTION
If you set 'Book' to 'PDF' under 'Book Setting' you can use Adobe RGB profile, 300 ppi, and your own Sharpening selection, which as Andrew Rodney mentioned is a better choice. You can submit the LR Exported PDF at Blurb's 'PDF To Book' upload page and they will do the proper CMYK conversion on their end. The only issue is that the images are still exported in the LR Book module as 8-bit color JPEGs. This may cause banding with a wider gamut profile, but that should be apparent when reviewing the exported book PDF.
Here are some comments from Blurb concerning using Blurbs 'PDF to Book' workflow, which is similar to what I just described:
From Me:
My Workflow Details:
My objective is to process all images in LR4 and then export them as 300 dpi, ProPhoto RGB profile, 16 bit TIFF images for layout in InDesign using Blurb's InDesign plugin (Blurb Book Creator CS6 v2.0.2.34d8). I will soft proof the placed images inside InDesign using its 'Proof Colors' tool and the Blurb_ICC_Profile.icc profile. Once the InDesign layout is complete I will do the RGB to CMYK Blurb_ICC_Profile conversion during the export to PDF process using the Blurb PDF X-3 Export Preset v1-1.
Blurb's Resonse:
Response Via Email(David) - 07/18/2012
Using InDesign and our Blurb InDesign Plug-in does mean you're using the PDF to Book Workflow. This is because your InDesign files will ultimately be exported/uploaded as PDF files.
Regarding, "Once the InDesign layout is complete I would like to do the RGB to CMYK Blurb_ICC_Profile conversion during the export to PDF process":
Unfortunately, there is no option for this and it's actually unnecessary during the export process. Our printers convert and process all images as CMYK using the Blurb ICC Color Profile, so even if you upload/export them with an RGB color profile, they'll be converted to CMYK for the production process.
My Response:
Customer By Email - 07/19/2012 05:10 AM Thanks for the explanation David. It sounds like I can just upload the PDF file using my ProPhoto RGB profiled PDF, but I would prefer to do the conversion from ProPhoto RGB to Blurb ICC CMYK profile. This way I can see the results before uploading the file to Blurb. Can I use the Blurb PDF X-3 Export Preset v1-1 with Output > Color Conversion to Destination > Blurb CC profile, and then upload the PDF file myself? If so please advise where I should upload the file on the Blurb website.
Blurb's Response:
Response Via Email(David) - 07/20/2012 03:49 PM Hi Todd,
If you do end up exporting your PDFs with the workflow you're referring to, you can upload your files here:
http://www.blurb.com/make/pdf_to_book
IMHO there's no reason why Adobe and Blurb couldn't work together so ProPhoto RGB 16-bit images can be used in the book PDF that gets uploaded (or exported!) to Blurb's website. Blurb then handles the CMYK conversion using full-gamut 16-bit images and not clipped sRGB 8-bit images.

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Austerberry wrote:
That does answr the question, but what I wanted to do was to soft proof the output of the Blurb printers.
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SRGB or Blurb icc profile better for soft proofing prior to Book module?

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