If I understand that correctly, it is referring to the wheel well height relative to the wheel, not ground clearance. I can't help thinking that is an oversimplification of how things interact however. Does that mean the exterior panel height, or the interior space which is larger?
Kind of a moot point for me regardless. Going any lower would severely impact ride and drive-ability. There isn't a lot of travel left and those sidewalls don't absorb much either.
On another note, I got foiled from testing more by the gods of careless contractors yesterday morning with a nail discovered in a tire. It was too warm to rely on battery cooling not to be active by the time I got that fixed.