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Quite clearly you have never been in a physics class. What does a spring do and what does the damper do? Go and do your homework. Can't compare Cup cars with the usual road/track car as they are running slicks on completely flat racetracks.
When altering the weight, it's most important to have updated spring rates. They should become softer with less weight as the static load is lower. Dampers are only for the fine-adjustment and are dependent on the spring rates.