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Look straight down on the edge, looking for shiny spots that are chips or rolled edges or lack of a complete bevel set.

From the side look for chips, micro or larger and any deep stria, they will...

Stropping, 40 laps is not enough and you may be using too much pressure.

It does sound like you edges are not that well established.

Stropping with too much pressure on Chrome Oxide is also a...