Just a further question:

Is there an noticeable difference between a Colonel X2L and a Commodore X3? The Colonel has a loft of ~46mm and a ~22mm knot, while that Commodore has a loft of ~50mm and a ~24mm. I think I understand how the knot being thicker works, but why is there almost half a centimeter difference in the loft on these two brushes? Will that make the Commodore X3 floppier, or does the thicker knot compensate for it? Is there some kind of accepted height-to-width ratio that gets applied to brushes or something?