Related to handle control is Seth's video on ski track vs handle track. It's on YouTube just search Seth and ipad. Seth's point is, (hope I got this right) at the point of maximum load, or should I say when the boat is at its most powerful, the ski should start to separate from the handle while keeping it in close.
Hard to do. The secret I've found is in the position in that my shoulders have to be back, hips aligned and knees bent allowing the start of the edge change. At this point im at a load of 7 soon to be by the 2nd wake at a 3! IMHO if your legs are too straight with a load around 6-7 at the 2nd wake, something's got to give and its usually 1 of 2 places, handle away from body, or in my case too often, it's breaking forward at the waist which is another popular topic !
Oh to be supple and have great timing. Nate smith does this better than anyone on the planet. My 54 yr old body has a tough time doing it unfortunately, but when it does, the load is lighter, angle is better, I'm ahead of the course and life is good!