This is a good question.
I would have to say with centermounts, go for asymmetrical skis. The reason is the sidecut.
Symmetrical skis, or perfect twins, have equal tip and tail length, forcing the ski to bend more to execute a turn. This will force the ski to do 2 things, wash out if the turning force because the centripetal force will overcome the ski-snow contact and also uneven force distribution; making the ski more unstable.
Asymmetrical skis are a work of art...mathematically. They allow a difference in the width of the tip and tail. The form of the ski will distribute the forces on the edges more evenly, letting the tip dig into the snow, the underfoot to maintain the tension on the ski and the tail for counterweight. However, switch skiing a different than regular turning. You need to begin with the tail and use the tip as counterweight.
So why the asymmetrical ski? They are hard to pivot the start of the turn, but they can carve and maintain very high speed with high stability. The symmetrical ski tends to wash out as higher speeds.
Now try with a rossignol super 7 2013s switch. You might as well saw off the tail because they are useless switch.