RE: Is 53 lbs of KE enough for a solid Passthrough ?
At 64# you are seriously worried about enough energy to kill a deer?
To be honest, if your broadheads aren't rusty, and are the slightest bit sharp, you'll kill the deer with 40# pull and the same setup.......REQUIRING that you can shoot.
Hit them in the front rib area at a decent range, and the last thing the deer is worried about is kenetic energy.