I have been thinking about a good analogy to this and one that comes to mind is this: Imagine back when you were a kid on a swingset. Remember the game of jumping off the seat to see how far you could jump? Well, if you use sitting in the seat like keeping the handle in during your acceleration, I think the same principle is easier to understand, at least for me. If you jump out of the seat (let the handle come out) too early, like at the mid-point of the down swing, you won't get too far, and maybe the seat ends up hitting you in the head. If you release from the seat too late, you go high, but not far. Somewhere at about 3/4 of the way up you jump from the swing and you easily go out to maximum distance. You are using the inertia to your advantage. At each rope length, there is probably some point of maximum distance out, but not too far, as in waiting too long on the seat. The ability to keep the handle in at the second wake depends on a lot of things. Technique, strength to weight ratio, etc. Even the west coasters still have a lot of pressure on the line at this point (watch their spray) force = spray. If they were simply gliding through the water, they wouldn't be throwing much water up. The shorter the rope, the greater the leverage for the boat (simply a sharper angle from the top of the pylon to the skier in a flat out acceleration postion, so that is what dials the needle up on effort. Clear as mud?