Digital BW, The Print

I have just instoled and tested the QTR 2.4.1 and the tone and everything looks very good 
except that the pictures are much more grainy than my epson driver? I have tested it on my 
R800, has it something to do with that printer or am I missing something? I use the 2880 and 
the 1440 setting and it looks too grainy to be used on smaller pictures at least. Am I doing 
something wrong or is the driver just more grainy?

Joakim