I am finding that the range of fit distance on my saddle post height is less than a cm. Just a hair too short and my knees hurt, a hair too long and my back hurts. Get it just right and both are okay. But it's a teeny tiny "window" that I have to hit. I am wondering if that's just me or others need it exactly on the spot? It's an issue since my bike is a folding bike and the seat post gets dropped to fold and I don't always get it exactly in the same place. You'd think there would be some wiggle room, but apparently not according to my body. Just curious if others have to be spot on or if they have a bit of room where it is okay...