There are a lot of canned profiles around that push down blacks by compressing shadows. I am not saying this is the case here,and I have not used this paper, but I am suggesting that you should get a good custom profile.
Thanks but that's not the case here. I use my own custom made profiles as well as the profiles that Colorbyte makes for their RIP which I use (ImagePrint).
But when talking about profiles I've found the PhotoRag Satin profile from Hahnemuehles own page to be very strange - not to say bad/faulty. It shows some serious banding in certain colours. So custom made is the way to go.
But still the paper itself is a beauty, in my opinion.
(About Hahnemuehles general quality... I haven't experienced much flaking when printing on "standard" PhotoRag but when I've printed on their William Turner paper it has been quite a problem. WT is yet another lovely paper, but with issues... similar to an interesting but challenging relationship )