The Tamer rear seatpost on our new Santana does not always return to its original position after it is compressed. I have tightened the preload spring (the screw that’s inside the seat post) but it still has a hard time fully rebounding with my stoker on it. She only weighs 115 pounds so I don’t think excessive weight is a problem. The post is new, so maybe the parts are still tight and will loosen up? Any suggestions or experience with this?