Are you able to create a new save now?

Ehh, I sort of understand where you're coming from but there are multiple considerations here:   1: Is it worth entirely reworking the combat to work off of physics or as you say, ballistics and trajectories, (properly syncing it to swing speed, etc while still considering skills and working out bugs that come with totally replacing the melee system) instead of just tweaking variables to improve the experience (or adding layers with the current system in mind) for what you want to achieve.  You can run calculations to trigger events like knockback etc that can resemble what you want without having to transition to physics based combat.    2: Sure, getting stabbed with a screwdriver really hurts as a person, because we feel pain. When it comes to actually punching through bone, you know, to get to the brain, your strength and endurance will absolutely matter. Even if you're the most skilled knife fighter in the world, if you're a noodle-armed pip squeak you're going to need to put some serious work into punching through a skull. And considering that a majority of the bladed weapons are makeshift implements or flimsy and not made for that purpose...   Idk, seems reasonable to me that when you're tired or unskilled you're having to punch through the skull like you're trying to chisel out one of those toy dino fossils from the plaster eggs.    The assumption, generally, is that your character is always hitting the head or face,  but you do have to use your imagination sometimes. If there was some more variance like glancing hits etc to depict when your character is not at their best, that'd be cool too. Or someone who's dead tired thrusting low w/ a bladed weapon and hitting the lower jaw or shoulders instead.   I think an alternative could be to introduce skill-based attacks that trigger randomly or can be used intentionally that have different properties, I.E a wide swing with a baseball bat that can hit one zombie into others to make them stumble in a correlating direction, or an over-head chop with an axe that is significantly more likely to crit, but takes more stamina or doesn't knock the zombie back, forcing you to position carefully to use it, or stabbing a zombie on one of the weaker sections of skull w/ a knife to get an instant kill. Visible representations of the character's skills that achieve similar goals to what you're wanting, something kinetic with a little more variation.    

Thank You for the report! the issue has been noted

I thought this was already how it worked, so yeah, +1

Man's out here doing the science everyone else is too afraid to do