Replying to Size Dilemma (help!)

Alright I understand this kind of thread has been posted and reposted a bunch of times but i need some help. I bought a pair of Surface No Times 2012 for 200 at a big sale a few days ago (OG price was 400). I had heard mixed things about surface skis but I figured for 200 bucks why not try them out. I rode a pair of line anthems 171 last year and kinda wanted two pairs of skis ( one to beat up and stuff). These surface skis are 172, they have early rise and they're pretty stiff but I'm 5'11 and 135 pounds, but I'm questioning whether or not I bought the right size. They didn't have the next size up (182) and I couldn't find it anywhere online. I have a kid that wants to buy them from me, but I'm not sure if I can find the same ski in a size up. Should I just mount them and ride them this winter (they're about up to my eyebrows) or sell them and look for something else that's pretty similar in the flex pattern and everything? Help me out