I don't really think you need to crunch numbers, although it will answer your curiosity. By your own experience you should see that you don't have enough energy to be suing the broadheads you are using. I wouldn't even consdier using them unless shooting in the area of 65lbs. That's why tuning a bow is so important. You have to get all the energy in a straight line right behind that broadhead. And on any kind of quartering shot it's just a question as to whether your arrow will start cartwheeling instead of driving straight through.