My take on Whip cord.
The angle between the apex of the braid and your hands will determine the tension of the braid. The wider the angle the tighter the braid. The other variable will be the distance between the hands and the top of the bobbins. This will determine the amount of swing is possible. This can be both good and frustrating. :) the longer the distance will mean longer time braiding between resets, but it also means that it will be easier to get your bobbins tangled in the swing.
the way I remember to keep my crosses correct is "the right, passes to the right. the left passes to the left." so when crossing your right thumb to the left pinky .. the bobbin on the right thumb passes to the right of the bobbin from the pinky. the bobbin from the left thumb passes to the left of its pinky pair.