U need speed for kinetic energy
Higher the GPP, lower the speed
Lower the GPP, higher the speed
Given ur GPP is constant at your arrow choice, u can only adjust the # for speed
But not all limbs are created equal, let's say shooting the same 8.5 GPP:
Morrison Max 6 Medium 45#OTF
Samick Sage Medium 45# OTF
Morrison Max 6 Medium will be significantly faster, so given GPP is constant, but with higher speed, Morrison Max 6 Medium produces more kinetic energy than Samick Sage
Thats why u paid more money in equipment, u buy technology, performance, smoothness and easiness to achieve benchmark
But for all things, good or bad, there will always be an equilibrium
U can't expect gaining speed by upscaling the # regardlessly, and there is so much weight a person can handle healthly.
So chasing speed for producing highest kinetic energy possible for extremely heavy arrow only exists in calculation .
Everyone needs to find their sweet spot in choosing equipment.
In real world situation, a Morrison Max6 Short with 41# OTF shooting 15.8GPP heavy arrows (648gr arrow) can drop a 1200lbs eland antepone with authority. No FPS data on that kill record but I assume the FPS will be around 160fps.
So about 38.82 foot pound of kinetic energy is more than enough to kill most games.