Digital BW, The Print

I tried printing on glossy paper for the first time using UT inks, a 
1280 and Epson's premium glossy paper. Using the carbon curves for 
Eboni black, the glossy print is a bit darker and there is some loss 
of detail in very dark areas. (The difference can be seen across the 
entire tonal range.)  To this point, I have only printed on matte 
paper (my comparison in this case is EEM) and I am not sure what 
conclusion to draw.  Is this a normal artifact of glossy paper, in 
which case it would be easy enough to apply a final curve to lighten 
the image.  

I am using Paul Roark's curves rather than the sliders.  

Steve