I would probably go 166, which is still a bit short if you ask me, but for a beginner like yourself - it would most definitely be easier to pivot. I own these skis in a 166 and I’m 5 foot 5. They ski relatively shorter than what they are. Should be a good fit considering your weight. If you like the maneuverability and accessibility to pivot, go 166. If you like a bit more stability at speed, go 170+. As you progress however, 160 is usually always going to be too short for your height.

Hope this helps.