I am going to use a new Windows 8.1 PC that has never had QTR installed and start fresh instead of a PC that has had several years of QTR upgrades installed on it. I am not a Mac person :).
The Ink Seperation target is part of QTR now, it was added once official support for the x900 series printers were added by Roy. The target is installed in the bin folder of QTR. To print the target I set QTR into Calibration Mode and then load inksep10.jpg image and print.
Regular K7 prints look okay and I mentioned in another post here that I get significant micro banding on Hahnumuhle Photo Rag paper and Epson Exhibition Fiber. As far as darkness goes, I believe it is an artifact of scanning Pictorico and not making any other adjustments post scan. Prints on paper look as I would expect them to look, shadows with detail where I want and crisp middle tones.
When I print on glossy or luster papers the LLK/GO does not produce color or perceived density, when printing on the Pictorico it does generate some density because of the nature of the film inkjet coating. The nozzle check image I actually adjusted post scan to crank up the contrast and make darker to demonstrate the nozzle check pattern. Looking at the actual Pictorico it is not visible unless viewed in specific way to get light to refract on the GO solution.
This is a brand new 4900, I installed the Epson Inks, ran calibration and nozzle checks to make sure the printer is working to satisfaction and created custom paper profiles using color inks. I then filled an entire set of cartridges with PiezoFlush and flushed the entire system of Epson Ink, followed by installation of another set of new cartridges with the K7 inks and GO. Ran multiple Fill and Purge cycles using the Epson Maintenance Application along with running individual channel flush targets to make sure nothing but pure ink is running thru the system. Ran thru calibration and head alignment again to make sure everything was up to standards.
I will be able to get some new sample prints tomorrow using the a different computer.