I've noticed the hiccup as well, almost as though the clutch is slightly releasing for a fraction of a second. I've never tried to iron out a specific speed and don't really remember noticing it pre-tsb. I don't usually hear it due to my music volume, but I feel it through the car. Maybe only a jump of a couple hundred rpm (max) on my car.
I just shrug it off. Not the right answer, I know.
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Hatch Nation #161