This was a pretty interesting trip! But how we can be sure of the hue for pictures if this has variations in all NTSC sets?
For my CoolCV emulator I wrote a YUV converter to RGB that runs dinamically because you can have NTSC/PAL palettes, the input values come from the VDP datasheet, for some reason TI shows all values as integers.
Y runs from 0-100, R-Y and B-Y runs from 0-84. (center is 47)
I gave a look to the AY-3-8915 values you show and that was non-sense for me, but the Papa document was pretty close to what I understood.
So I've took the Papa document values, passed them thru my YUV converter adjusting my contrast number and I surprisingly I feel as it looks like in screen.