considering how cheap gk tech front RCA's are theres no point in not trying them out
you wheel track also plays a part so make sure front and rear is equal or front has more track then rear
try stock gtr front sway bar and i've also noticed once changing my worn rear sway bar bushes this made the car more oversteery
edit: make sure current castor settings are equal ( loose bolts, bent parts, bent car) as if not this also deals out understeer