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An off-the-wall suggestion:

. . . If you start with a pile of lather in the bowl, and it disappears after 5 minutes, the water may be evaporating.

So add a bit of hot water to whatever is left...

FWIW --

1. If you have both fabric and leather strops, and you can strop _without_ rolling the edge, give it _lots_ of stropping -- 50 fabric / 100 leather. That may correct any edge damage you...