RE: anyone bow hunt africa
Just an observation but cut on contact broad heads instead of mechanicals and a heavier arrow and your going to have better penetration. You kind of proved that or so it seems. Even with 78 lbs a mecheanical strips energy from the arrow to open it. Rage BH are the best I have seen but still take energy to open. Cut on contact take no energy to open. And a heavier arrow takes more to slow down.
Sure it won't shoot as flat out at farther range but you'll probably have a rangefinder and have practiced up for that kind of trip. So what are the downsides of uping the arrow weight and going to a cut on contact?