Digital BW, The Print

I'm using the Roark VM inkset.  In comparing prints made with 
the "nc" curve ["nc" means neutral to slightly cool; to my eye the 
prints appear perfectly neutral], and those made with the "mw" curve 
["mw" means medium warm; to my eye, it is a rich sepia tone], there 
is a significant difference in perception of tonality.

I am consistently finding that, when comparing the same image printed 
with these two different hues (neutral vs. sepia), the neutral ("nc") 
prints seem lighter and less weighty than the sepia ("mw") prints.  
Do we differently perceive the tonal range (white to black) of 
different hues?

BTW, the 21 step gray scales for the "nc" curves and "mw" curves are 
very comparable.  After having worked on the curves for much of 
yesterday, I have now locked down a final, "nc" curve and am close to 
the same for the "mw" curve.

I am working on an Epson 1200 on a Mac, and am happy to share those 
two curves with any other VM users.  I am also working with Paul to 
develop a complete set of curves for the 1200.