The video of Jeff Rodgers, linked on the home page a few days ago, gives a great example of what it means to be too early. He makes reference to it in the commentary. As the rope gets shorter the less time you have to 'hang' out beside the boat waiting on the ball.
For me, learning 38 has been more about getting off my pull than the pull itself. I've been surprised at how little it takes to get out to the buoy line. Excess speed into the ball kills my turn and then my pull into the next ball. I either try to kill the speed in the turn (which results in overturning the ski) or ski long down course (which sets me up late into the next ball).
38 has been a lesson in energy management. If i can get the angle w/o the excess speed thru the gates, then i've got a good shot at running the pass. I think this is what I see/hear Nate Smith doing.