Replying to Need help sizing if you guys are free -

Hey guys, I really do not know how to size for skis, im a snowboarder :O but started skiing again and made a dumb decisino but didnt hurt but heres the info:
Height: 5'11" // 6FT
Weight: 140lbs

i got some used 156 lib tech 2008 park nas skis for a great deal so i had to but they are super short so i dont feel comfortable going everywhere outside the park. i was looking  towards the same ones but in a bigger size around 173 is that too short still? or good because i was thinking around 173-176 would be good.

i do about 80% park 20% groomers/etc
65% Jumps 35% Rails / Boxes

also anyone have experience with lib tech nas i dont think they are that popular but ive used mine 2x [bought near end of season and my season just ended] lol. how are the edges any experience with them popping off etc? thanks.