Hi Oggy ,
I checked out your trip video of last year . this years skiing is a lot better already to my eyes .
One of my focuses with the feet is at transition , in the " float " stage , the feet are pulled back right from the beginning of the release and kept back while the edge change starts . The edge change and tipping is also started while the feet are under the body in the float so there is no lateral force at all in the early stages . Just a feeling of balancing on the edges with legs still flexed .
The lateral angles should never be forced . It is tempting to try and get angles and CB too early , the resulting angles are thus inappropriate or false if you like . the angles should always be dictated by slope and speed , they are not an end in themselves .
Notice in the 2009 Tignes video , going for the big carve and big angles , the position looks forced and you are " rail riding "