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I don't actually understand what I'm looking at with the arc display. It's not immediately apparent what's being compared and which is better than which. Seems like a normal scatter plot would be better.
Yeah, they look impressive at first glance, but then you realize it's not that easy to read, probably because they are upside down. Usually these things are more useful with the base at the bottom and not at the top left corner. Also, I have to point out once again that most of these graphs and tables don't make me want to look at them for more than 5 seconds, mainly because of outdated design and bad colors all around. When I have some spare time I might do some hacking on PTS to make it more pleasant to the eyes.
The color scheme is the biggest problem of the graphs presentation.
I'm not a coder, but choosing a color in a HSL model (hue, saturation, lightness/luminance) could solve your problem.
For X different colors, divide the Hue scale by X to get the same difference in hue for each color.
I you have more than, say 8 colors, you can get 6 new by selecting a new value for Lightness. And you can again multiply those colors by varying the Saturation.
That way, you will avoid getting too similar colors.