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Rocker will put your contact points closer to your feet, making it ski shorter. On an S3 2010 has rocker in the tip but not a ridic amount and still has camber under foot, you probably won't notice it at all.
Original Post: I'm 5'4" and under 120lbs. I ski 167 in the park and 175 all mountain. If I read correctly, moving up from a 160? I think you're going to laugh at a 160 after you try something else :)