We use on coated:
C: 1,35-1,55(1,35)
M: 1,35-1,55(1,35)
Y: 0,93-1,07(1,0)
K: 1,65-1,9(1,7)
My experience is that it is optimal to run with the numbers in paranthesis above, as they provide us with optimal printing contrast, however it is really a matter of which blankets, colors, fountain...