If what Ernst says and measures is true, i would reprofile. Just using the IGS profile is then sub-optimal.
My review of the hahnemuhle photo silk baryta shows this.
Right now I think your Hahnemühle review/test says more about the new IGPFS than any older article on IGPFS says about the new IGPFS. Of course it would be even nicer if someone reviewed/tested the three identical papers I mentioned and published it in English. May be a disappointing project as I expect not much difference between the three.
I have no knowledge of the Simply Elegant Gold Fiber paper quality. I can measure it when I receive a sample. One thing is certain, there is a group of Fiber/Baryta papers that show the properties of the old IGPFS and there are now three papers that show the properties of the new IGPFS. I see distributors claim they have a paper that is a replacement for IGPFS and what they have is from one of the two groups. If this continues it is likely that there are two sources for the papers. This may change though. It must be quite simple for any distributor to get access to one of the paper qualities.
When I ask the Dutch speaking representative on the Ilford Imaging booth of the Photokina 2014 three times whether the fresh Ilford Imaging sample book he gives me has samples identical to the old production and I get three times a "Yes" then I have no restriction in expressing my reservation about representatives if my testing shows that at least 75% of the papers in that book measured is not identical to the old production. The range is different and either the spectral plots are different or the texture is different or the weight. Some come very close like the IGPFS and the Smooth Pearl RC but are not identical. If I then compare the IGPFS with a sample of the Hahnemühle Photo Silk Baryta that I got before the Photokina and see a 1:1 resemblance I know there is a source. Measuring the new paper catalog of Felix Schoeller tells me where that source is and rumor on the Photokina already confirmed some distributors are not happy that Felix Schoeller has a fine art paper catalog open for everyone. I tried to get baryta paper samples from FS at the Photokina 2012 but they refused then. It has been the main baryta paper base manufacturer in Europe for at least half a century, long before inkjet baryta papers appeared and it has patents on inkjet baryta papers. Comparing all the samples of the new Ilford production with known big manufacturer's paper samples shows Mitsubishi and Felix Schoeller ties, while some papers can not be identified. On that observation I get a confirmation from someone I trust in the industry.
In my opinion, in general the new Ilford Imaging papers are less unique as they have been when the papers were still coated in Marly, Swiss. Whether all the old papers Ilford Imaging used to sell were all coated at Marly at that time is a question I have no answer for. On a German forum a message says that the old IGPFS was produced by Felix Schoeller, it would not surprise me if that is correct. The new one may just be a new development on the old one. The uniqueness and quality of the new Ilford paper range has to be found in practice and new tests, including fade testing, Simply declaring that the Ilford Imaging Galerie Prestige range is back and identical to the old range is cutting ethical corners, at least in my book.
There is an approach to stay with company descriptions of their products and review the products based on that information. That should keep contacts with the companies prolonged in time which can be a good thing to keep fast access to new developed products etc. I would like that too but I think that it should not compromise the interests of the paper users in the end. The last will happen when the company's descriptions are not to be trusted.
Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htmDecember 2014 update, 700+ inkjet media white spectral plots