So I breadknifed my Theirs-Issard because the heel and tip were just not getting honed. The blade was a smiley, so I just flattened it out on a 1K Shapton pro stone. It took less than five minutes.
I will be doing this to my Solingin Bismark next, even though I have been quite pleased with my last 2 shaves with it.
Say it ain't so Tom, take a look at this thread here and maybe this video series here. Than go and sin no more.