Vlad, what you are preaching is not very orthodox, but the truth is, I've seen it used more and more (I've seen Grandi, Ligety and Bode do it to some extent) and I've "discovered" the same thing this season when playing with fore/aft movement of the feet.
One thing tough, I don't do it the same way as you do: I try to keep centered until the very end of the turn (basically when I pass the gate) and then let them swim in front of me while getting my hips foward and down the mountain (diagonal pattern) at the same time. What this accomplishes for me is an instant weight release and an early entry in the new turn: really smoothes out the transition, while at the same time "accelerating" the ski somewhat (helps in channeling the rebound and seeking the falline).
Also tried this technique in gs on the flats where I go it to work a couple of times. You gotta be smoother tough, since the turns have a bigger radius and the force buildup is that much greater. On the other turns, I simply try to have as much separation and angle possible and exit the turn with the same hip move.
And back to the subject at hand:
- Upright torso: people tend to bend at the waist in order to pressure the tips more at the entry, don't, you'll be that much more powerful in the turn.
- Inclination: finally we can use some inclination (at the very start of the turn) without fear of the ski railing out and falling to the inside. Altough it is used a lot more in gs, it also has it's place in slalom now.
- Long oustide/small inside leg : the greater inclination also allows greater angles down there. Don't use your knees primarily (altough they get used somehwhat but a lot less than before). Also, use the hip when a stable base is there: you'd be amazed at how much angle you can get (mere mortals like us can almost get the butt on the snow in slalom, I've done it a few times on steep pitches, with video to prove it*).
- T(ips) to the T(ails): engage the ski fully through the arc. Not only will you be able to have a rounder arc, transition will be a piece of cake.
These are some of the pointers I usually give to people new to the slalom type of ski: some are ex-racers, some aren't, so your mileage may vary with these techniques. But experimentation and refinement are key on these skis, since they need to be pushed, hard, in order to perform.
* You won't feel how low you are until you see it