ShottieMan: Were your shots single action or double action. With double action I can understand low hitting shots but with single action, if you are hitting low I would say you have developed a case of the flinches.
I would ask a good shooting buddy to come to the range with me and to load the pistol with one round in each magazine and have him trick you as to whether he has chambered one or not. With an empty chamber and, subsequently no recoil, you should see if you flinch or not when you drop the hammer.
If you have the flinches then you just need more practice. Since those Walthers are double/single action, you can practice at home with an empty fired case in the chamber and develop your shooting grip and trigger release techniques. I used to do that in front of a mirror so I could keep the sights focused on the bore of the barrel, so that every time I dropped the hammer the sights wouldn't move. After practice I would go to the range and my scores and hits would improve. It worked for me and hth. Mikey.