i run 7kg, fr and 8kg rearIdk why we all always buy 7k/7k or 8k/8k etc but we do. The vehicle weight distribution is not balanced so neither should be our springs I would think.
I obviously am one of the same F/R people but I may change that.
this helps my rotation and dragstrip launch
but for non drag use, imo it's better to use the coilover adjustability
and some weight loss up front
to balance the weight distribution on the car
this allows the same springs all around and a more balanced platform
most companies use higher spring rates up front to
mt, runners, auto-xers, and road racers should avoid that setup