I shot single bevel heads for many years, of many different manufactures. As with any broad head, or bullet for that matter. You have to hit them In the right spot. That said, I have sense used many fixed and mech. heads and find no advantage to the single bevel heads. I find I very much prefer bigger holes, most single bevel heads are on the narrow side. The rotation of the single bevel I found no benefit what so ever, after shooting animals with wider cutting blades. And blood trails with the single bevel were no better then any other like sized holes produced with any narrow broad head. I Find three or four blade narrow cutting heads produced better blood, but not as good as big wide holes when the broadheads cut what they supposed to. Nothing wrong with single bevel heads I killed a lot if animals with them, but spent a lot of time tracking animals , that I believe with a wider head I would found must sooner, and easier, and failed to recover a few as well. As now that I shoot wide heads, my tracking jobs for the most ( if I do my part) are much shorter, and heavier blood on the ground helps with my recovering them. As far as unethical, I am not sure what your getting at, it’s up to us to make the shot count. And take only shots that we should be taking.