I bought a leather album with Hannemühle Photo Rag® Duo 276 gsm to print bind some fashion show pictures, found the manufacturer's profile a bit wanting in the shadows, and made my own which other photographers printing on PhotoRag may find useful.
Email me (no PM please), and I will forward the profile, and you can compare with your own prints. The solarisation issues with the manufacturer profile can be spotted by looking at that profile with an inspection tool.
edmundronald at gmail dot com
Edmund