Caster will affect your dynamic camber in proportion to how far you turn the steering wheel. One front tire will gain camber, and the other tire will lose camber the further you turn the wheel. So this is an ideal adjustment to consider when one tire has a good temperature profile and the other does not.
A great way to analyze this is to watch your dynamic camber on your car while it is parked and you turn the wheel back and forth.
That doesn't do any good for your back tires however, and may not be enough for your fronts. The next step would be to increase your ARB stiffness on the affected axle. That's the whole purpose of your ARB - to reduce roll, and therefore reduce the magnitude of dynamic camber changes. The affect on oversteer/understeer is more of a side-affect, although one that can be very useful.
Stiffening your ARB is a big trade-off, however, as it does one good thing and one bad thing. We already talked about the good - maintaining camber. The bad thing that stiffening your ARB does is increase lateral load transfer. This takes vertical load off of your inside tire and puts it on the outside tire. This reduces the tractive capacity of the inside tire and increases that of the outside tire, but reduces the tractive capacity of the pair overall.
Lap times will tell you if the trade-off is worth it.
Hope that helps.
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