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My unscientific thoughts:
1) weight removal is always beneficial, even if it hurts the car's balance.
2) weight placed at the rear will act to increase the polor moment of the car, making it more prone to oversteer - especially the undesireable "snap spin." Personally, I'd move it toward the cg. Also keep in mind when you are counteracting driver's weight that battery relocation is illegal for any reasonable racing - and is useless for HPDEs (b/c you usually have an instructor w/ you).
3) in your 2d question, you are talking about two different types of oversteer. Reducing the weight over the tires will reduce power on oversteer for the reason you stated. But, increasing (or keeping) weight over the rear tires should enhance the "pedulum" effect/ polar moment, resulting in increased lift throttle oversteer. Generally, I think increasing the polar moment is a greater concern that keeping the power down. ESPECIALLY w/ an NA KA.
4) moving more weight over the front tires is bad in any event. That area already carries a higher amount of weight. Also, the front tires do the majority of the braking and all of the turning. Generally speaking, weight plus use means the tires are more prone to overheating. Overheated tires don't grip - understeer.
Hope I helped - others feel free to show I'm wrong (I didn't think much here)
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