You know, that rings a faint bell with me too, but what we're seeing (those of us that do see it) is pretty much a straight dump from the light black cartridge... somewhere in the neighborhood of 18% gray, or thereabouts. I did consider doing as you suggested, briefly... and then, once I found the fixes, just decided to redo my profiles in version 2 (for color) and use the other QTR script for B&W. Fortunately, I kept my targets, so it was mostly scanning...and, honestly, I didn't do them all... just the ones I use the most.
Happy holidays!