To follow up on how to consistently reproduce your saddle position time after time, I would be remiss if I did not address fore/aft position. Saddle position, much like your handlebar position, is measured in two planes. The X (horizontal) and Y (vertical). Both these measures are taken from one central landmark on the bike, your bottom bracket.
Here are two way to accurately measure your fore/aft (X, horizontal) position and make documenting and reproducing your saddle position reliable and consistent.
A weighted line is a simple and reliable method to measure the fore/aft position. Ideally you will have your bike level on a stationary trainer. You could also lean it against a wall in the most vertical way possible but this introduces a few variables. Your line should be long enough to drop past the chainstays and bottom bracket.
Take a ruler or tape measure and align it with the center of your bottom bracket. Let the weighted line settle to a consistent point. Perform a few repetitions to ensure the line is settling consistently in the same spot.
There is your fore/aft position! 9.1 cm is the example used in this post.
You are all set to get your saddle dialed in after any maintenance, changes in seatpost, and to replicate your position on a similar style bike with the same saddle.