Hey Dan, you are going to have to go to a bag butt buddy, LOL. The best one I've seen thus far is the American White Tail. Its a big one and should be hung (I don't). Have you tried to suspend your Block so that it's movement will absorb some of the energy? Here's a pic. I has a pic of a whitetail's vitals on one side and dots on the other. This target needs some attention. I bought it before xmas and I have gone through it already (up to 50 or more per day 5 days a week at 20 yards). I will probably get away with just stuffing it with more cloth.
Don