Uberti Cattleman 10/4/09

At 15 yards the revolver prints 250gr lfp with 8.0 grains of Unique 5-6" low and about 1" left. Groups are consistent. Can change the front post position relative to the rear sight channel to get it on target. The question is whether I file the front sight or paint the portion that must be above the sight channel a contrasting color.