Reactive Caster means that under braking or whenever the front springs compress, you will get a reduction of caster. Less caster means more steering. When you brake or dive into a corner, the front springs compress due to weight transfer causing a reduction in caster so the car will steer more. When you accelerate out of the corner, the front springs return to regular height and therefore the caster returns to your static caster setting. (White spacer placement) If you feel like you need more turn in, then go to the ten degree caster blocks.