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When you select Photoshop Manages Color, are you using our pre-made "CCP-7900" profiles, the standard Epson profiles, or your own (or other) profiles? What Media Type Setting(s) are you selecting in the Epson print driver when using Hahnemuhle Photo Rag Pearl and Harmon Fiber Gloss papers? I have made several tests with various combinations of Epson and Cone Color Pro inks with great results, but did not test the exact ink combination you are using of CCP with Epson PK. Epson PK is slightly glossier than Cone Color PK (because Epson's contains some dye to make it work better on gloss papers, and ours are pure pigment), but your print shows an extreme difference in glossiness from the black to grays. I expect this will not be an issue once you start using our PK ink, and should be able to print without spraying to equalize the glossiness. Have you seen our Cone Color printed samples? The gloss samples are printed with our 7900, and would give you a good example/reference of the full set of Cone Color inks on Epson Premium Glossy Photo Paper.
Please let me know if there's anything further I can help you with.
Best regards~ Dana