Heavy arrows don’t necessarily carry the most kinetic energy as there is an optimum arrow weight for each bow and how it is set up. Heavy arrows carry more momentum so the kinetic energy doesn’t deteriorate as fast. I went from light (400gr) arrows to heavy (570gr) arrows (finished weight) and haven’t noticed a difference in penetration yet as I was passing through every animal on the light arrows.
I have noticed that the speed curve is flatter out to distance and so is the shot beyond 40 yards.
A 350gr arrow out of a bow at 55lbs with a pinpoint accurate shot will kill anything in Texas....
Worry about accuracy, not arrow weight or speed.