Axes generally wear fastest at the top of the edge. I mean, if you are going to miss and hit a rock with any ax, where is the most likely place to hit it? At the top of the edge of course. Every really old heavily used ax you see (or most of them anyway) are badly worn at the top.
So a rock solid handle mounting, and then reshaping the ax to match, is more important than the couple of degrees you may be able to change the handle mounting.
If hanging an ax doesn't really mean shaping the edge? Well it should.
The center of the edge is not really the most powerful place to strike. Most axes are ground for it, but its not the true best.
The lowest part of the edge you can accurately hit has the most power behind it, by far.
When hewing with a broad hatchet that has a reasonably straight edge, this is superbly apparent. You take the deepest bites at the bottom, clean the waste with the middle, and feather trim it with the top of the edge.
After a few hours serious hewing, nobody needs to tell you this.
In many places it just means gaining the necessary skill to excel at whatever you are doing. But we all knew that. \
yours Scott