Most people mistakenly set their preload way too tight so they can jump higher without bottoming out. Too much preload eliminates sag which makes handling horrible. You need sag because your shocks need to not only absorb bumps, but also let the wheel drop down for dips. With too much preload and the car "topped out" every time you go over a dip, the wheel flies through the air for a little bit and then hits the upside of the dip as it ends and causes instability instead of the tire being able to drop into the dip and maintain contact with the track. Most people get used to driving like this and sadly never get to experience just how good their car can actually handle. Drop your car from 8 inches and see where it settles. If the shocks fully extend (slowly pick the car up, chassis should rise before the wheels leave the ground, if wheels leave the ground right away shocks are fully extended) your preload is too tight. Look up "setting sag" if my ramblings are nonsense.
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