There are two philosophies in regards to spring rate.

Stiff with no or little sway bars. Makes for jittery rides on less than smooth pavement.

Softer springs with big swaybars. my preferred setup.

Adjust the freeplay in your steering box, procedure is in the FSM.

Odds are most of your handling issues are due to lack of alignment. What are your current specs?

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.