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In general, I and others have found that if you get a strong 'violin' hht off your coticule (where the hair bops across the edge) your edge is at a point where you can finish on water (30+ X-strokes,...

Try your hand on the unicot method as outlined on coticule.be.

It's a bit more straight forward, less specific coticule dependent and more fool proof than the dilution method.