Replying to Cant decide which size to get Anthems in

alright i know i've put my opinion in several times on what size ski people should get but im really in a pickle here. Im getting Anthems for next season, i've already decided that, but i dont know whether to get the 171 or 178. Last season i had Mothership's that i used both park and BC that were 172. i liked them in the park but they were a little short for BC. i've also got 1080's that are 181 that i think are too long. im 6'1 but i like shorter skis. im going to get a fat ski too this season so the Anthem will be used only in park, centermounted of course. ideally i would get like a 174, but line doesnt make that so should i go 171 or 178?