Replying to Vishnu Wet Sizing

Hold on I know there's a lot of pages on this but I thought my situation was just a little unique. I am an east coast skier buying Vishnu Wets planning to ski them purely park. I see everybody saying buy size up and some people saying just go with 189s (which I'm pretty sure I should do). I am 6'2 and 150lbs. So that seems to suggest 189s. However I have had shitty 173 and 177 cm skis up until now. I know Vishnus ski short but 177 to 189 does feel like a fair jump. But I guess maybe because its short its like 177 to 183 which isn't all that bad, and realistically I need to be going up anyway. Let me know what you guys think. (Also let me know if I fucked up this post Im new to newschoolers I understand u guys hate newbs.)