For sure I did revisit it…checking also the L channel…it was good to know because its also true for the L channel and I had thought it was 50 = 50 in LAB so that was good to check. So 18 for mids in L and g channels and while in theory .5 for the perceptual Jz…your testing at .59 is likely good…
It has really never been a problem as I rarely try to select a precise range like that. I either use the auto picker or move the sliders to highlight visually the area that I am trying to target so I had never really paid any attention to the nuance of this …