Digital BW, The Print

Hello Everyone

I am customizing my own UT2 curves to use with a few selected 
papers.  I am making neutral curves and have had success in making 
the tonal adjustments so there is more cool tone than warm tone in 
the print.  The cyan (cool gray ink) is greater than the yellow (warm 
ink)ink in the shadows and highlights.  Paul Roark informed me cyan 
should equal yellow for the middle 25%-85% of the step wedge.

However, I now need to make changes to the density (white to black or 
K) so there is a smoother tonal ramp.  How do I adjust the density 
without making any changes to the neutral tonality that I presently 
have with my customized curves?

Thanks in advance.

Regards
Ross