Here are a couple of pictures of my value chart and wheel.
I have sent what I feel are my best 2 white to black wheels. For some reason the picture is upside down which means that the one on the left, marked 2, is the one I feel happiest with. Still working to get better gradations since I think the difference between 1 and 2 is not sufficient and between 3 and 4 too much. Also I think the inner circle is too close to 2.
Somewhat hard to tell when the paint is wet.