I suck at 270's

So all season I have been trying to push myself riding wise, and one of the things I have been trying to get down is 270ing onto boxes, i have done a good number of them, but there have been a couple, that have just destroyed me, the first was the one i slipped out on my toe edge and landed flat on my chest and this DESTROYED my brand new Special Blend Jacket. I seriously wanted to cry because it was so pretty, but after ward it looked like some one pooped on their hand and smeared it all over my jacket. I was so depressed. Then just on Saturday i tried the 270 again on a down flat box. Same thing happened, toe edge slid out, and SMASHED my shoulder, and once again ibuprophen  has become my best friend.