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I actually have an old time barber, and while he doesnt slap it into the strop, he does press pretty darned firmly into it, and it does sag a bit, and his shaves are just fine. Sometimes I...

Too much pressure, or too much "slack" can give rise to "too much stropping"
But if your technique is good, it should be fairly much impossible to over strop. At a certain point it wont be...