Jesse,
Not getting a pass through on a 1/4 ing shot is the result of hitting the far shoulder not from BH or bow problems. Elk are pretty easy to get through because if your like me, you stay away from the shoulder and punch nothing but ribs and lungs.
Not all animals are like that, especially these dang pigs we have. Kill zone is low and way forward so you can't go behind the shoulder but an inch. Through the shoulder makes sense but then you get limited penetration, especially if you hit big bone. Turn the hog away from you and you get really big bone and muscle on the far side. It's a dead hog, but in tight brush and only one wound, you might have a hard time finding him.
Mike