Agreed. Much easier to learn the HA at the edge of the window in anything other than minimal winds. Your reactions need to be razor sharp if you are going to succeed in the centre of the window. Do it at the edge and everything slows down and yo have time to break the moves down into their individual components. You won't need to give as much slack either.
As always - it's what works for you. A good test of top leader's adjustment - put on the farthest out knot - try launching - if too hard or not at all - move in a knot - try again. Keep repeating til launch is doable. Should take a little effort, but the "in air" performance should be much better!