I use QTR 220.127.116.11 with an Epson 2200 and matte paper. I've printed so far with 280 dpi (a 3018x20010 pixel file printed on a letter size paper to about 10.76x7.17") and noticed a slight loss of contrast as compared to using the Epson driver. To compensate for this loss of contrast I've applied and S-curve with 3 points on the curve: 64/58, 128/128 and 192/198. So far so good.
When I print with 305 dpi I notice a greater loss of contrast that would require a more aggressive S-curve. I would expect the same tonality across a wide range of dpi's. What is happening? Would switching to the newer QTR 18.104.22.168 resolve this problem?