Replying to I can't cork anymore, +K for help!

Hey guys! About a year ago i knew how to do corks on trampoline, i could do corks from 5 - 12s. then i learned how to do a Bio. And i practiced they bios ALOT. And now, everytime i try to cork, I end up doing a bio 9, and it pisses me off. Well, now I'm going summerskiing in a week and I'm praccing the corks a lot because i really want to learn how to cork on skis, still i get no progression because the only thing i do is the same old bios. I can do cork 5's but when i'm going for 7, I either do a Bio 9 or a strange underflip 7 thingy.

So any1 had the same problem? What to dooooo?