In relation to shock settings and stiffness which is better? Hard setting in the front softer in the rear, or Harder in the rear and softer in the front?

I was under the impression that a softer setting in the front would help reduce understeer, is this true?

My current set up is as follows:

Ground control coilovers with Tokico Illuminas(5 way adjustables).
Currently set on level 2 in front and 3 in the rear.