I'm not a Honda guy, and not familiar with what kind of suspension is on your car off-hand, but those seem like REALLY stiff spring rates. For comparison, Ground Control recommends 380# front and 250# rear for their street setup. (usually gives pretty decent balance, but not overly harsh ride) That's 6.8 & 4.4 kg. You're over twice that in the front and about twice that in the rear. Should yield a super-stiff ride, and I would expect it would also understeer.

From the typical street setup, you'll want more rear spring for autocross to help combat the understeer of a FWD platform. You can make up for some of it with swaybar, but life is easier with stiffer rear springs.

The Tein RA kit, for instance (road race setup... more oversteer-biased than street, but not as extreme as you'd want for autocross) is 14/10. Compared to yours, a little softer in front, a little stiffer in the rear. Nice compromise for a net improvement in overall balance. Probably still way stiffer than you'd want to drive on the street, though.

You never answered if your swaybar was front or rear. If it's front, it's just going to make the understeer worse. Honestly, if you go with springs THAT stiff, you could get away with completely removing the front bar. (not uncommon on autocrossed Hondas) It's stiffer rear suspension that you want on a FWD car.