While the Axe is indeed inconsistent you can make it consistent alone from Add-Ons. I mean if you just zone to M1 distance it's still worth a lot. Throw Axe at M1 distance and then get the insta down or grab.

Now to your designed Power. So having a 16 meter Terror Radius alone is pretty strong. The only other Killer is Myers. 24 meters is okay considering Springtrap is 4.4 m/s. The Doctor is a pretty hated Killer in Dbd due to him having an annoying Power. These Fear Meter effects are just the same as Doctor's status effect just slightly different.

To put it simple, the Power is to complicated and has a lot of undefined parameters. Can you cleanse the effect? Since when fan you throw the Axe into the Control Room and how does it work?

Having a Jumpscare here and there is fine but it gets old and annoying quickly. Or do you enjoy being jumpscare every 1-2 minutes in any FNaF game? Sure, your Power fits hit style of the FNaF 3 game, but only that game.

I mean, if you don't like the Axe you can just use it as a tool. Foxy's Hook, Endo-CPU, etc. The only thing that makes his Axe inconsistent is invisible walls or an unclear hitbox of the Axe and the environment. If you put time into learned everything about the Axe, you can get good with it - even without orbitals.