It's really not a simple answer. It depends on so many different factors. Normally tires are more "happy" with a few degrees of negative camber; "happy" tires = more grip. With that said there is a limit, continuously increasing camber does not continually increase grip.
Now that is considering the rear tires by themselves. When you put them with the entire suspension system, especially considering we have fwd vehicles, it gets much mroe complex. With fwd, we can never experience power on oversteer, the gas pedal on a fwd always increases rear wheel grip up to the maximum grip potential, never going past that limit. So the only opportunity to have rotation is entry-oversteer, lift off oversteer, however you want to word it. There are many different ways of achieving this. Decreasing rear wheel grip in general increases oversteer, as does increasing front wheel grip. This can be achieved with sway bars, springs, damping, camber, toe, tire width, the list goes on.
So, can you share more information on your setup?
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