Addendum for my previous post: I was using the Onkyo PR
SC 5507's controls to adjust things a bit more. I was using it's Gamma control - it is providing separate 10 control steps for Red, Green and Blue. I was able to dial in colour temperature and the Delta values a bit more, but I was loosing proper gamma for the individual colours, as you can see, especially in the 50 -90 % range.
Plus: Adjusting things was really hard, since the steps, that these gamma controls are providing, do not seem to be linear. They are named "0" to "9" and you might think, that they correspond to the 10% IRE greyscale charts, which they don't. Steps "0" to "4" seem to correspond to something between 5% and 30%, the higher ones seem to provide controls between 50% and 90% IRE.
It was all a play of mere guessing and trying (anyone who knows more about the 5507 controls: please jump in on this!!!).
I just had the change to call up the greyscale "windowed" charts and tried to adjust things in a way, that within the ColorHCFR-Software, the small RGB-"picture" in the lefthandside (the little red, green and blue "towers") was producing 100% for each colour for each of the 10% charts.
So, this is how far I could get, here are the corresponding charts. CIE-chart is still off, as you can see, and I am not sure, whether I achieved any advantage over the first calibration, escpecially, when looking at the sacifices of the "Luminance"(?????) and the (don't know how to call it) "RGB Gamma" Chart"....
Any advice is more than welcome....