It would be useful to copy full question and answers into forum as not everybody is on ATPL online.
That said "Skittles" has explained it. However I should like to add a couple of pointers.
The correct term is "balancing drift" and it only needs to be done when working out a heading and/or ground speed when using the wind down method. Do NOT balance/shuffle for any other problem.
As the correct term suggests you have given a track/course you have to turn into wind to allow for it. It is this very turn that changes the original angle of the wind which may lead to having to "shuffle" a couple of times. You ALWAYS turn in the direction of the dots new position.
You are "balanced" when your dot on the drift lines = the number of degrees (heading to track) difference in the opposite direction.
There is another & simpler way if you care to PM me.