I've noticed using f1perfview that the rear suspension on my BF1 setups doesn't gain camber with lateral tire loading as quickly as the front does (plot lateral tire force vs. camber gain). If you look at the suspension on the setup screen, the front suspension has shorter upper arms, while the rear suspension has shorter lower arms. I suspect this is the cause. Do you guys concur? Could it be something else?

That makes sense. It's only the suspension geometry that determines camber change with spring deflection.

So that seems to require much higher roll stiffness than I'd like on fast tracks like WE, because the differences in camber characteristics cause a balance change between the slow and fast corners.

This is all stemming from a problem I'm having in keeping the inner tire edges cool while running the camber I want. The suspension travel on WE is so large that you get ginormous cambers in the fast corners like T1-4, thus heating the inside edges a lot. If you reduce static camber to compensate, you're losing a lot of grip in the slow important corners, like the final hairpin. It looks like stiffer springs and ARBs are doing the trick because they are keeping the camber sane everywhere.