Fair enough.
I have noticed, especially on my T4 over the summer, that I get better mid-corner stability with the inner ball studs lower in height (hard packed dirt/clay, light dusting, low to moderate traction). I had thought that this was coming from more weight over the outside tire due to more roll (although in your video, I see it is actually less roll), thus generating more grip, but it appears what actually is happening is that there is less camber change and so I am maintaining a larger contact patch throughout the corner.
So...
As far as the impact of roll center on traction is concerned, is there a good way to describe its impact without confounding the effect of camber gain (e.g., shorten the camber link as the inner ball stud is raised)? Otherwise, it appears to me that there are conditions whether either a low or high roll center can give you more mid-corner grip...