Hand Tools Archive
When you think of the process as identifying a spot that's too high and lowering it, then repeating, you are more likely to succeed than doing anything blind.
The problem some encounter is that a convex surface can rock, taking the blue off areas that are high compared to different planes. If you started by placing the plane on the reference surface and adding feeler gauge shims so it did not rock, that would give a stable orientation. Bluing the bottom and rubbing with shims in place would remove blue to mark areas whose removal would be more certain to lead to a plane.
This isn't really different from what you were doing, it's just emphasizing something else you were doing without explicitly stating it: being very careful to not rock the plane while lapping.
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- A novel method for flattening plane bottoms..