big bulls has some knowledge on this - light arrows, mechanical broadheads and any shot other than perfect will suck for you as a bowhunter
KE is irrelevant really, and used my manufacturers to sell products, did you know?
did you know frontal shots are some of the most lethal in all of hunting if you can make the shot? I had long, long debates with a bowsite guy and you know what? he's right
when shot's go bad, you DO NOT want to be shooting light arrows and mechanical heads
with high energy/momentum combinations, getting the arrow into the vitals is a the key, and broadside/frontal/quarter away/quarter to ....... if you can make the shot, take it, make it and your designed to penetrate setup will not fail you
did you know, the most common shot taken that results in lost/wounded animals is the broadside shot? why would that be if its such an excellent shot? answer - because shots go bad, they just do, your equipment better be ready to help you when they do