I'd just ignore the conversion chart and stick to the normal fitting process with the first chart. Like you said, stick to the numbers, not what the color label is.
That conversion chart almost seems backwards. Its weird.
Maybe the new std black dot is a different lie angle from before?
The rep didn't tell me "black dot." The factory did when I tried to order "-1 inch" and "purple." They said "using the new conversion chart she's black dot now."
But if black is just lie angle, why is she -1"/black and not -1"/red or -1"/orange? Why did -1"/purple (-1.5°) become -1"/black (0°??)?