RE: How much KE are you shooting?
Dave, with that high of ke, I assume your momentum is up there as well. Just in case you want to figure it, take your arrow weight x fps and divide it by 225,200. This will give you your momentum figure.
Dr. Ashton' s study showed a momentum of .57 increased the likely hood of penetration adequate for a killing shot by 80%, even when encountering bone on the largest of beasties (rhino, cape buff, etc). I wish he would break down what is needed for similar performance on whitetail size creatures. Perhaps in his next study...