Digital BW, The Print

Now i have made my very first full carbon prints with MIS eboni (Black 
Only) on Brilliant Museum Satin Matte (this paper is like the 
hahnem�hle photorag).
The results of my printing are quiet nice but i get some broncing / 
different gloss effects in the black areas of the prints using the 
Eboni ink and the blacks could be deeper. Is broncing a typical problem 
of pure carbon printing on cotton matte papers? Is there any workaround 
for this? When i do BO printing with a cheap 3rd party dye ink i have 
no broncing effects at all and the blacks seems to be deeper. But i 
know these inks are not archival. It�s interesting to me that the 
grainyness with the cheap ink is much more a matter than with the Eboni.

Sometimes i want to have just the best from both sides. But it might be 
impossible and i still have to make compromises?