I can tell if a bevel is set from the feedback from the hone, let alone a TPT or loupe. Its not a argument, that yours is wrong, its just my opinion and choice, on bevel setting, and what I'll subject my blades to.

If you can't except that, then maybe over 40 years of honing about everything under the sun, and countless thousands of blades from pocket knives to machetes, axes, ect., will. If numbers are what concern you.