Don't feel bad mouser, my score was 33, and I thought I did a good job – although I knew it wasn't perfect, as it was quite hard for me to see much difference between adjacent colors.
Flash Toy of the Week: How Well Can you Differentiate Colors?I am sure that the problem lies in the quality of our screens, it can't be our eyes.
By the way, did you notice how even (flat) your distribution was, mouser? I am not quite sure what that means, but it is quite impressive.