Suposing correct tires and suspension setup (keep in mind harder springs makes the car less cornering), several thing to test:

- Thinner front sway bar.
- Thinner front diff oil.
- If the car has understeering when mantaining throttle inside an open corner, try MORE caster (move rearward front upper arm)
- If the car has understeering the first moment is entering corner, try LESS caster (move forward front upper arm)

More things to test, like ackerman or rear-end rotation. But first try steps above.

REMEMBER: each change has a positive effect, and a negative side... that's the difficult part: find balance.