I on my 3rd year of trapshooting, and after doing fairly well at 16 yards (3 25's, pretty consistent 22's & 23's), I'm now shooting 20 or 22 yards at various leagues. I seem to have trouble with the up/down aiming at the targets. At 16 yards with my 870TB, I put the front bead right on target, and it smokes. At 22 yards, I seem to be shooting over the bird with the same technique. Should I be adjusting my up/down aim at longer yardage? Or perhaps my gunfit is poor, causing my mid-teen scores? (there is quite a gap between the beads) Or, perhaps it is THAT much tougher 12-18 feet back? Any suggestions?