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The HHT is useful when you know what you're dealing with. I can't help but feel it's of less use to the inexperienced.
The Wiki article is a good guide on gaining an understanding of how to use it...

At the 8K point the "teeth" are probably grabbing the hair & popping it. 12K is smoothing them out & refining them, so it's not such an aggressive edge & less able to grab. The strop probably refines...