Digital BW, The Print

Hello all,

I am printing with an 1160 and MIS FS-N inks and lately I've been
quite pleased with my results as far as smooth tonal gradations and
sharpness of my prints on EAM. Yesterday I printed this image:

http://www.contaxg.com/document.php?id=6276&full=1

and it came out just beautifully with wonderful highlights and smooth
mid-range tones. But the blacks seem more of a very dark grey instead
of a rich, deep black, especially in that area in the bottom right
corner. Is this an ink issue or paper issue? Perhaps I'm getting the
darkest black I'm going to get from FS-N ink? Would another paper 
give
me blacker blacks than EAM? EAM is so cheap and the results usually 
so
nice that I'd hate to have to use a much more expensive paper but
would for those images which are prominent with darker black areas. 
Or
perhaps it's a curve or levels adjustment issue?

Suggestions?

Regards,

Richard