Becka
From looking at you targets, I would guess that you are "ambushing" the target. Everyone, and I do mean everyone, has some has a wobble zone when they are on target. By wobble zone, I mean the arc of movement of the gun in your hands, when you are pointing at the target. If you look at how much movement your firearm has, it is normally rather small. For most of us the wobble movement is a bit over an inch or maybe two.
The problem, and what I guess that you are doing, is that a shooter watches the movement and tries to make the gun fire "right now" when the sights are just where you want the shot to go. Any time that you try to fire right now the shot will go low.
Think about how big your wobble zone is and ask yourself is you would be happy if all of your shot hit somewhere within the zone. To do this all that you have to do is is keep adding pressure to the trigger and not try to have the gun fire right now. What you want is a surprise break. You know that the gun is going to fire, but you do not know the exact moment. BTW, with some practice and a lot of dry firing, this can be done very fast.
In a class last weekend, we showed the students how to do that and they were all pleasantly surprised.