If I remember correctly you still wanted to increase caster for more straight line stability. Maybe this is an opportunity to also profit from the inherit increase in dynamic camber related to steering angle? So just that little more bite in the short corners, while maintaining the same amount of (safe) understeer in the long high-speed sweeps?
Besides advantages in mass, smaller wheels might also give the advantage to use them in combination with a tire (shape) that is less sensitive to positive camber angles; if that is a point to consider?
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