Replying to Buying First Twin Tip. Length?

Hey guys

I'm buying my first pair of twin tips soon. I'm 5'11'', and last season I skied a short 160cm ski (non-twin tipped), and loved it. I tried a 170cm ski, but in comparison it felt clunky, and harder to spin.
I ski mostly park, and am planning on buying a 170cm twin tip. They reach my eyebrows when upright. Considering I enjoyed a 160 last season, would a 170 be the right length for me to buy? Is it uncommon for skiers my height to ride a length this short?
Any advice would be appreciated.