QTR-Quadtone RIP

I've done a few further tests and, so far, I could not measure any change on my prints when applying the QTR generated profile during output. This should be some kind of bug. I have generated and used my own color ICC profiles for years and never had any problem like this.

Target output is not the culprit. I was able to compare my original procedure with the Adobe Print Utility and also to the output from Photoshop in RGB format, and the results are identical.

I've tested in the Light mode of the Epson ABW driver, which produces the least linear output of all modes. At this time, the resulting curve was very unlinear. After generating a profile with QTR-Create-ICC-RGB and printing with it, the results are indistinguishable from the original chart. The profile is doing nothing and I also can't see any changes when soft proofing with it.

You can see my results here: http://imgur.com/crgqS Those are the L values comparing output with and without the ICC profile.
Any ideas?

Thank you,

Fabio Pili