Definitely the longer size. At your height, if you're an advanced/aggressive skier, you could probably even go 182 for the extra stability. But definitely no shorter than 173
"What you are feeling is a base burn. The toilet bowl cleaner probably has a really high pH , and therefore must be neutralized with an acid that has a really low pH. So basically, you just need to stuff your asshole with the most acidic shit you can find, battery acid, sulfuric acid, nitric acid, whatever you can get your hands on. its gonna be a chemical showdown in your asshole today my friend."