[Tommy]

In simple terms, as the caster angle increases the front wheels tend to line up more with the direction the car is traveling. This makes the car want to go straight. This is good for cruising in a straight line. It is not so good when you want to turn. Decreasing the caster angle makes it easier to turn the front wheels for things like parallel parking and autocrossing. The correct caster angle is the one that fits the way you drive. If you want your car to have a little more resistance to turning and it's not too hard to turn when going slowly, increase the caster some and see how you like it.