Don't hit as hard as you think, abot 2.5 sections from the top is generally the way to go. I can't get past 6 from 15 (I've had that three tiems now). You find that if you're going quite well, the pressure starts to get to you and you start snatching at em a bit, although maybe I'm taking it a bit too seriously
Anyways, six is the record and I've got to go cut the grass out the back.