I own and use Richard's set of Tools for QTR and strongly recommend them as they are useful for both beginners and advanced users of QTR.
Let me remark first that I am a carbon transfer printer who has been using digital negatives for almost twenty years, and during that time I used image setter negatives and numerous inkjet printers and methods, including Burkholder, PDN and various other forms of colorized negatives with the Epson driver. Since 2007 I have used QTR for making digital negatives, in fact I learned QTR from Ron Reeder and have since continued on my own, and with the help of others. I recently published a new book on carbon transfer, The Carbon Print, that has a long chapter on negative making, including digital negatives, that covers both history and pratice. Even those who are not interested in carbon pritning might learn something from this chapter.
https://www.johnlockhart.net/carbonbook/If you are looking for a very effective method of making digital negatives with QTR and the Epson OEM k3 inks please have a look at the files I have posted on this forum. Files>Docs>QTR Files for Digital Negatives. Ans specifically, look at the files Carbon 100.doc, and Carbon 100.txt. And testing would cost you nothing but a bit of time since you are already using QTR and an Epson printer with K3 inks. The newer Epson HDR inks also work well, though some adjustment would be required to reduce negative density since these inks are a bit more opaque than the K3 inks, i.e. they block more UV light.
I quote from the Carbon 100 doc file.
Carbon 100 is a QTR profile for printing digital negatives with an Epson K3 printer. This profile uses a single gray value where all curves follow the K. The profile uses the three inks in the K3 ink set that are effective UV blockers, PK, Y and LK. The LIMIT of these three inks has been set so that all three are approximately equal UV blockers, which serves to give a smoother look than when unequal UV blockers are used in this type of profile. The other inks in the K3 set are set to a LIMIT of 1 so that some ink goes through the nozzle but not enough to impact the overall density range of the digital negative.
The output of the Carbon 100 profile, before linearizing, is straight line. The profile may be linearized with a curve in the K, as in CURVE_K =, or the profile can be linearized with the LINEARIZE command, using either a spectrophotometer or densitometer, as in the attached profile. In fact, one method can be used over the other to allow for a general profile and specific ones for variations on the process.
The density range of the profile can be adjusted for process requirements by increasing or decreasing the ink LIMIT of the PK, Y and LK by an equal percentage. Increasing the ink LIMIT results in a higher density range, decreasing it in a lower density range.
In my own personal work I use both the Carbon 100 profile and and a multi-gray partionned system. Both have advantages and disadvantages, most of which are too complicated to discuss here. But both give really outstanding results, and are easy to adjust. And both profiles can be easily adjustment for both density range and linearity with basic QTR tools.
Sandy