Replying to ON3P Kartel 108 sizing

Hey guys, so I'm relatively new to skiing (first year) but I'm already slashing through most terrain pretty aggressively. I am currently running an older pair of K2 Kung fujas at 169cm, I'm looking at upgrading next season to set up some Kartel 108s. Just wanted to get some more experienced sizing between the 176 and the 181. I'm 160lbs and 5'9" and ride primarily in the Canadian Rockies and Interior British Columbia. I appreciate any input!