Digital BW, The Print

Hello, I have finally installed my new 1290 and a UT2 CFS. While on 
matte papers the results are fine and on par with the results of 
my former (but unfortunately broken) 1160 - all attempts to get a 
satisfying print on semigloss paper failed so far.

I tried the curve workflow - mostly with the neutral curves) and what 
I get is a nice print in the lighter and *very* dark shades, however 
in the darker grey zones - like shaded zones of skin - I get a 
relatively coarse black grain which looks a bit like "snake skin" - 
dont know how to describe.

I also tried BO at 2880dpi, this dot/ grain phenomenon doesn't occur 
there, however I can see the fine horizontal lines of the printhead - 
its just not fine enough. 

SO basically I am unhappy - I bought the 1290 as an upgrade to my 
broken 1160, however the 1160's results with UT1 on Semigloss were 
clearly superior. Might it be a problem of the curves? Or does UT2 
not work well with Semigloss papers? 

I hope I will get this working. 

Thanks, 

Bernie