Digital BW, The Print

I recently installed a UT2 inkset in a new factory rebuilt Epson 1280 
printer. When I print using Slider Controls or curves, I get very 
uneven distribution of densities at the light and dark ends of the 
scale as measured with a X-RITE 810 densitometer;

Light		Density
0%		0.09
5%		0.11
10%		0.14
15%		0.18
Dark		Density
85%		1.71
90%		2.05
95%		2.23
100%		2.24

Between 20-80% the distribution is relatively even. Using curves, the 
distribution is even worse. I have reviewed the latest instructions 
on the MIS website and I believe I'm following them pretty closely. 
Any suggestions as to what the problem might be?