I'm back after days of measuring, mixing and tubing. For results there are nine tubes of hand-mixed paint in Munsell values 1-9. It's probably impossible to reach the extreme values of 0 and 10 in paint. In the chart below Holbein Peach Black starts off the low end with a value of about 0.5. The high end is Gamblin Radiant White with about 9.75.
Apologies for this photo... Once the scale dries and can be scanned safely I'll post a better image.
More soon as I examine the chart in Photoshop and tune up the paints as needed.