Brian,
If your hitting one drumstick and both wings and the other leg are still working good, I'd say you need to adjust your shot angle.
Quartering to you, a good shot would be center mass between the beard and head of the drumstick. The exit would be dead-center between the opposite drumstick and the vent (polite for "butt-hole").
Quartering away (my favorite) would be vise-versa.
Straight-on is tough because they will see you. The best might be straight away. If their fan is open, they can't bust your movement and you have a very plain "aim-small, miss-small" spot to concentrate on, the vent.
Closer than 8 yards or so is TOO close for me. Hard to keep movement concealed. Past 20 is not good unless your a REALLY great shot. The sweet spot for me is 12 to 17 yards. I can hit a softball hanging on a string 8 out of 10 times consistantly.
Both of these birds were shot quartering away. Fans closed. The broadhead exited 3 or 4 inches to either side of the beard. You can see the arrows in both pictures. Lisa shot her's at 10 yards, I shot mine at about 12. Her's, of course, is bigger.
OkKeith