OP - sorry about that. I have no idea when a Kamm is most effective, but I know the theory and practice of it's application, based on information attained from this site and other sources. None of which are personal experience.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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