if your in doubt, shake your arrow, and if the sound loose or they open then there not in all the way...i found that sometimes i push them in and i think there in but there actually not, also when there in look at the o ring, theres a little hook on the blades, and if you cant see the tip of the hook then there in.
and that hole looks pretty decent, is that the left or right side shown? no blood trail is weird for a lung shot with that hole, but i have seen funnier things happen with deer. like a few years ago i shot a doe, arrow looked good as far as blood, she ran about 100 yards and didnt see any blood until about 10 yards from where we found her. arrow took a pretty good size chunk out of the heart too. if it didnt snow the night before we wouldnt of been able to follow the tracks and would of lost her