Seems you have the lapping question sorted but this may be of interest.
I had a problem with chipped edges on a Spyderco fine hone and everything made it worse till I used contrarian thinking.
I found the softest Arkansas stone I had, actually a white Waschita and sawed into that using a slurry of powdered household cleaner. Took some time & cut deeply into the Waschita but sorted the bevels without any more chipping.