That blade could be a “lemon”, tempering could be bad, geometry could be off…
If you use a layer or two of tape and the edge improve then shave with it a few times to see how long the edge lasts. If it does not improve… the steel may have been badly tempered (or somehow lost it at some point in its life).
Another suggestion is to take your self out of the equation… send it out to another honemieter, I am sure someone out there would love to help resolve this mystery.
CS
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