I understand this. I always bounce the suspension after making adjustments/measurements. I'm thinking that the "dampening affecting the preload" thing might come down to stiction mentioned above. Bouncing the bike after say, cranking the rebound up, could theoretically slow the movement enough to show a different measurement. Is everyone taking stiction into account?Damping will not change sag if you just twiddle the adjusters with the bike on a stand. But when you are checking sag, loading/unloading the suspension, it does affect the measurements.