Since fitting new front shocks and springs the car feels a bit understeery. Doing the rears is next on the list but i'm just trying to get my head around suspension tuning.

Amongst other things one method to reduce understeer is to fit stiffer rear shocks/antiroll bar/etc OR soften the front. Does this reduce understeer because rear grip is decreased?

I'm just thinking if your old suspension is quite soft and gives a lot of body roll - renewing the front gives more understeer, to balance this you renew the rear. How much grip have you actually gained?