This is exactly what I'm trying to get at. When you sat on the bike it went down rapidly, but when your light friend does it moves down slowly. It'll still move down since you haven't adjusted the stiffness of the spring just the rate at which it moves. If you took that same bike and backed out the compression completely, you and your friend will still end up at the same respective points, you'll just get there faster. Lets say a 200lb person is on a pogo stick with the compression maxed out. They make the spring compress 2". Now a 100lb hops on and the spring compresses 1". Now take all of the compression out and the 200lb guy still makes the spring compress 2" and the 100lb guy 1", but they move the spring faster.