You definitely need to get switch down, switch straight airs are good too (low speed, they're scarier than shit the first couple you do).
Another thing I like to practice is going down the hill like you regularly do, then continue your carve all the way around until you're facing back up hill. Then jump and turn 180. This way you're doing a 180 at speed but you're still landing your regular way facing back down the mountain.
'12 Lib Tech T.rice / '12 Burton Cartels
'10 CustomX / '10 Co2 EST