Katana, you have done a good job so far, and I can only tell you what I would do, not what you should do – as the decision is entirely up to you. If I thought the blade was watered, and I think you may be right that it is a possibility, I would go on cleaning and then etch, if I felt that not too much steel would be removed. I would prefer not to advise on the koft gari only from a description, but maybe someone else can.
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