In my experience on carpet with foams:
1d hubs with 2d in-board toe-in (shims)
* Decreases rear traction on entry and mid corner
* Increases rear traction on exit (anywhere on-power)
2d hubs with 1d in-board toe-in (shims)
* Increases rear traction on entry and mid corner
* Decreases rear traction on exit (anywhere on-power)
In the past I've used the 1d hubs (with 0d in-board toe-in), but now I use the 2d hubs (with 1d in-board toe-out for an overall 1d rear toe-in) as it loosens the rear end on-power.
The more out-board toe you have in the hubs, the less the camber changes at the wheels when going from off-power to on-power. It brings more overall rear stability.
Now, the more the rear arms are swept further backward (less in-board toe-in), the more your rear tires will increase in negative camber as the suspension squats under power. This reduces the contact patches of both rear tires, thus reducing overall grip on-power. But since its negative camber gain, the outside loaded rear tire is leaning more into the corner and it gives a very controlled rear end rotation.
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