Well, your rebound has nothing to do with your springs. Your suspension is essentially a couple of springs. All the oil does is control the speed at which the spring moves down and up, by several valves. So you have 3 things with suspension. Preload. This is down to the spring. The preload is essentially means how low the bike sits. The preload you have set (how compressed the spring is when the bike is sat there) controls the sag of the bike (how much the forks drop when bike is at rest.) Then you have your compression, which is controlled by the oil in your forks. Your adjustments control how quickly/easily. Last thing is your rebound. This controls how quickly the fork returns after it has compressed. Rider weight doesn't have a whole lot to do with the quality or range of rebound adjustment. So do your forks sit too low when you sit on the bike (you should have parameters to look at on the paperwork for the forks) Is your issue that they ride too low, or that they drop too far, or too quickly?? Do they bottom out? Is the issue you have to do with them returning? Bongo