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i bet you start standing your blades up (on spine edge up) that the side to side warp will lessen (also make sure you quench in a updown slicing motion
you can also get a pair of gloves and tweek a...

DC
coat the lower part of the blade to save it and jsut let the top get all scaley and nasty (to some ) thats how you will want to do it
BTW
the chunkyer and blacker scale is most the time from...