How much droop and how much spring pre-load you want depends on numerous factors. Lots of droop will allow the spring to press the unloaded tyre back onto the road. The downside with lots of droop, particularly on the front of open wheel racing cars, it tend to exacerbates the problem at the rear and the car may pick up an inside rear driven wheel - resulting in wheel spin. This is why you want lots of droop on the rear of a car with an open diff, and why you can often limit the front a little bit. A normal coilover setup will compromise this setup because of differing corner weight heights will alter the droop/spring rate. Experienced drivers would most likely notice the difference, though not the average kid.