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You see a lot of videos of guys, even those who have experience that twist their wrists & I guess they've adapted to that style but the old barbers manuals recommend rolling between the fingers. ...

Maybe someone already said it but keep the blade almost flat on the face. Hard to do in some areas but it helps immensely with the flexing that hollows can have.

Anyone that's shaved with a Fili 14 EPBD would disagree with your assertion.

If they have rubbish steel or aren't honed right or aren't used right, that's another matter.