Different hue values in cool grays

[aagonzales]

Cool Gray 80 and 90 have a hue value of 300 but Cool Gray 1-70 have a hue value of 180.
Are they supposed to have the same hue? What is the logic around how color steps are determined? Just curious really.

[jordaniusrex]

The color values are based on a normalized transformation of the CIELUV color space that attempts to approximate the human perception of brightness (HSLuv) with accessible values (based on HSL/HSB). So while 300 Hue and 180 Hue seem like they're far apart, in reality, the difference in color at that lightness and saturation is minute—the color picker is using a slight hue shift to achieve a subtle contrast difference.

[aagonzales]

Ok thanks for explaining that!

I've got a follow up question now, that I just saw upon further investigation:
Gray and Cool Gray have the same exact colors for 80 and 90 (at least on the site) but Warm Gray has its own variant. Is that correct?

Sorry for asking so many questions. I'm just trying to work with a lot of the darker colors and they were coming across not as cool as I would want at larger swatches but the 90s and 80s in the blue category and actually too blue for my purposes.