When skiers come in late and hot around 6 ball, they turn the buoy normally and end up taking a huge slack hit. When they come in late and hot around earlier balls, they s-turn and cut back to the wakes without a slack hit.
So why doesn't anyone s-turn the 6 ball? The only reason I could see not to is because you may end up cross the wakes before the gates, which doesn't matter on earlier balls but does after 6 ball. But I have to think you could adjust the pull to make it through the gates, at least in most instances.