I've done a bit of data reduction. I'm a believer that the deviation of x and y in the CIE space is probably the simplest set of numbers to look at if we want to get an idea of the effect of the clearcoats on color.
That being said, plotting the deviation (as a scalar) doesn't tell us which direction the color is moved from it's original. But, it's enough to get a quick look at how much the clearcoats effect the color. So, here we go:
Thanks to benven for starting this effort and mech for the measurement data.