Bouncy feel comes from the struts performance. The spring will control the roll of the car while rebound during a bumpy ride will control the "bounciness." A better quality strut is almost more important than shorter and stiffer springs. When you go to a progressive rate spring, which every daily driver should, you will only rely on the strut to control the ride. ADjustable struts would be the perfect solution. Than you could crank them to stiff when you want a rock hard ride for fun and loosen them up on rebound for a comforatble stock-like ride. Lowering the car, though will never give you anything close to the ride quality undera any circumstance. You completely change the geometry of the suspension specifically the motion arc of the control arms. If you had both upper and lower adjustable control arms (ie. Porsche) you could radically change the height without affecting the ride comfort, but we don't. Also, using the stock dampers that require a certain amount of control in travel, with a shorter than stock spring will cause them to bottom out, as we should all know by now. There are dampers designed to work at various levels [most aftermarket dampers].
