For rear sights, the higher the number, the taller the sight. For front sights, the higher the number, the shorter the sight. This can be confusing to remember. The easiest way to think of it is, numbers up, groups up; numbers down, groups down. This is true for both front and rear sights. Each number change on the rear sight will affect POI 2" per 25 yds. Each number change on the front sight will affect POI 1" per 25 yds.
Keep in mind bullet weight affects POI - if the sights were regulated with 147 gr bullets it will shoot below POA with 115 gr bullets.
Make sure that you let someone else shoot it just to confirm your low/left POI before you start changing things around.
Adios,
Pizza Bob