"Why they put numbers on the side focus when we all see differently I don't know."Interesting! When you see the target in a scope you are looking at the image of the target on a lens in the scope. If the parallax is set correctly the target and reticle are on the same plane. Maybe try setting the focus on the scope (eye piece). If it has a side focus try changing that. Why they put numbers on the side focus when we all see differently I don't know.
General adjustment for a quick final focus. A SWAG ;-)