Could it be the FFG blade is moving side to side?…or the tilt angle changed? BTW are you using an angle cube or just the graduated marks on the bar? These could all contribute to a negative result…
This is a good point… especially the FFG moving side to side… wouldn’t take much to change the angles, so worth checking. I’d also still Sharpie between stones, you don’t have to mark the whole blade, just enough to insure things are staying aligned.
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