When I run some KE calculations I get the following scenario: 540 grain arrow @ 267 fps gives me 85.5 KE. If I were to reduce the 40 grains and shoot a 500 grain arrow @ 280 fps it gives me 87.06 KE. My assumption is that a heavier arrow will give me KE and penetrate better, sort of confused on this. According to this the 500 grain is a better choice? Looking for some direction on this if possible. Thanks in advance