I would not say that corks are super hard. stomped a 7 on my second try. you really just have to go for it and do it. however, cork 3s are much harder because you have a lot less rotation to bring your feet back under you, same goes for with 5's. also, just because you have a trick down on a trampoline means nothing, sorry. it is totally different on snow. the jumps are angled, you're going fast down a hill and your skis have swing weight. way harder.