It looks like you are using an ad blocker. That's okay. Who doesn't? But without advertising revenue, we can't keep making this site awesome. Click the link below for instructions on disabling adblock.
I think thats fine, since youre only jibbing around, the shorter length will decrease the swing weight and make it easier and more playful. if you are gonna do more all mountain skiing though, I'd size up to like a 178 for the extra stability at speed