Nothing inadequate about your broadhead. Something happened with the shot placement. If you had punched through both lungs you'd have a tag on him. A one lung hit deer can travel a long ways, even possible to recover. As far as adequate goes, consider this. A friend of mine arrowed a buck a few yrs back. Shot placement looked great. Double lung. Blood trail looked a little spotty, though, so he called me over to help. When I got there we started at the shot location and I picked up his arrow still stuck in the ground after the pass thru. Coated in bright frothy lung blood. Then I saw his broadhead, or should I say lack of. He accidentally shot it with a field tip! (Note: it's a bad idea to even have one in your quiver just because Murphy's law says it's gonna happen if you do.) Luckily, we recovered a very dead, double lung shot buck a hundred yards further. The blood trail was just weaker than it would've been. If a tiny, no bladed field point can kill a deer quickly (very luckily) in the right spot, a razor sharp 1" broadhead has a definite advantage!