I moved this thread into the current thread I am helping you through to keep it easier for me to keep track of your questions.
You are using a Carbon ink set which in nature is Very Warm, as it's name implies. There is NO comparing against Epson BW, that shouldn't be an evaluation in general, these 2 ink sets are completely different.
I do not have a Canson Velin Museum Rag curve for any of the printer models that match your set-up & paper ie. CBN ink, Canson Velin Museum Rag & 4800. The closest thing I have is the .quad file I gave you. If you don't find this sufficient you can purchase a Custom Curve for $99 each.
From the looks of your print, I don't believe you are doing anything wrong. I believe you are simply not familiar with how a Piezography Carbon print should look. The attached image itself is not that great, but from it I can see they are very different, especially in the highlight areas, like the cloudy section, there is fair more depth in the CBN print, then the BW print. Take a closer look at the shadow areas as well and you will find the same, much better detail.
You are a new user and it will take you time to "master" your domain, it's all about trial and error with a little guidance. You are on the right track, now if you can get used to the CBN's warmth! Out of curiosity, how did you decide to purchase the Carbon inkset for your set-up?