Hi again Marta,
The women world cup slalom skiers are now using 150-155 cm. skis. Often when they get into trouble, they are in the back seat
[something caused them to lean backward,i.e. they are no longer centered on their skis.]Often, when I have watched them comptete on TV there is so little ski behind the heel piece of the binding, literally, there is not enough ski to "fall back on," so they often hit the deck on their backside.
Remember, you are on a woman specific ski, it is forgiving Volant ski, and you should be fine.
Go forth and ski in confidently, knowing that your skis are fine.Your boots and alignment may be another issue that you should check out.