I can't say that I would be comfortable with that set-up either, but........
Primitive Archer ran an article a year or three ago--I'll see if I can find it. The fellow that wrote it did some experimenting with a VERY slow, very light-weight selfbow, using natural shafting and stone points. I think he was restricted to 3 or 4 shots on a very recently killed deer. Every shot penetrated both lungs, and I think all but one penetrated the far side. Seems that one shattered a rib on entrance and hit a rib on the far side. Broke the rib, but didn't penetrate the far side. Every shot would have easily killed the deer though.
Finally weighed the bow my best friend's daughter used a year or two ago for her first recurve kill. If she came to full draw, she was shooting 29#. Again, not something I'd recommend, but it did the job just fine.
Point being that you don't have to spend a fortune on a bow, arrows, and broadheads to hunt. Some places will try to make you out to be unethical if you aren't using the latest whiz-bang set-up.
Im with LBR, you don't need the latest and greatest carbonshafts, single bevel heads, and Extreme FOC to make clean kills. I believe to much is made of all these studies, and if we took them to their logical end we would all shoot wheels, because on paper they look more efficient, but Traditional Archery lives beyond numbers. There is a, dare I say supernatural, edge to the stick and string. In our modern age we rely on the "science" of archery to much. Tell Howard Hill that he needed a extreme foc, carbon shaft tipped with a 3:1 single beveled head--I think he would have laughed as he pulled the his wood arrow out of the freshly killed Griz. As far as ethics are concerned, we are putting a sharp piece of metal through a living creatures heart! If that metal Pierces the Heart, Why should we care what setup is used to accomplish it? The fact that we are willing to take the responsibility of killing in our own hands, makes us far more ethical then 98% of americans who disreguard the fact that their hamburger was once a living creature.