I have installed a set of Classic Heinie sights (#320) on a G17L and a set of SlantPro 3D tritium sights (#319) on a G17. Both pistols shoot too high. They both shoot ~15-18" high at 50yds and several feet+ high at 75yds with 115gn bullets. Both have stock barrels and shot spot-on with the factory sights and the Meprolight and Trijicon sights that were installed prior to installing these Heinie sight sets. Any thoughts?