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This is pretty common really, and isn't necessarily bad heat treatment. Often when steel is quenched it will distort if there's any residual stress. The razor makers of course need the spine to be...

It's not the stones IMO. The pattern would almost certainly be very near the same on both sides if that were the case. Aside from this, yes the importance of stone flattening was already mentioned...

This was posted on bnb also. My diagnosis there was the same as was posted here early on in the thread - the spine is slightly crooked, so honing the blade results in one side hitting heavier at heel...