Converting CMYK design to K+1PMS

Hello,
My design was originally created as a CMYK. Now, it needs to be converted to a Black + one PMS. Using channels, then copying and pasting portions into a new PMS channel, I thought I had it. However, two portions of the design are not looking right, and they were grayscale from the get-go!:
1) The grayscale photo I placed in the design is very washed out and I don't know why. It almost appears like it has hard light on it.
2) The grayscale illy design that I placed in this Photoshop design is also washed out.
Any ideas? It's almost as if the mid-range color (albeit grayscale) has been lost.
Thanks in advance for any advice. I'm placing the design into an InDesign piece, and have half a mind to just delete the photo and graphic from Photoshop, and then bring them in straight into ID.....but I'd love to know where I've gone wrong in the Photoshop conversion.
Thanks again,
Cynthia

Duotone? Set to black and your PMS color.

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