Sorty but thsts not the case. Any drastic amount of camber, caster, toe (among others) creates improper suspension geometry. And the outer wheels gains negative camber via suspension compression.
Well softer suspension set up properly will yield more mechanical grip. I personally like a car to oversteer a little bit for fsdter corner speed. But set ups are purely driver oriented.
The amount of HP needed to reach specific speeds depends, on weight of the vehicle, aerodyanamics of the vehicle, density of the surrounding air, and a multitude of other variables. Once the veriables have been pinpointed for each scenario you can plug them into an equation and figure the needed...
Traditional go karts dont actually use springs for suspension because of size. Drivers use over rotation to turn the car go kart. You would have to fabricate your own chassis and utilize custom casing with dampers and springs. The spring rates would be quite low as the weight of the go kart is...
take it to a shop that has the ability to corner balance the car. theyll be able to tell you the individual weight of each corner. Curious as to why you would choose to auto cross a juke though.