While watching some of the pro skiers on video, I noticed that they lean longer as the rope gets shorter.  At 32-off, many begin the edge change in the white-water before the wake and move the edge-change to the white-water after the wake at 38 or 39-off.  Would this trend towards changing edges sooner at longer line lengths carry through to even 22 and 15 off?  I am trying to help a skier with his 15-off pass, but it has been a long time since I skied 15-off.  I am not really sure where the edge change should be at 15-off.  I know his technique and efficiency change where the edge-change will occur, but as a reference, I was curious if the pros would change edges even sooner if they ran 15 or 22-off.