Each shot on each animal is different. I've shot bows with over 70 ftlbs of KE for the last 10 years and I don't always get a passthru on whitetails, Heck I had a passthru on a bull elk, came home from that and didn't passthru a doe with the same bow/setup.....

Upgrading won't garuantee you a passthru but I've never had an arrow that didn't at least leave an exit hole even if the arrow stayed in the animal.

I applaud your desire to upgrade for the sake of human kills etc....perhaps it's time for a new bow, that is up to you but I'll tell you one thing, it's difficult so shoot them all and good luck...