A drill we did the other day for doing intermediate carves for switch:
1) Head to a green hill
2) Riding switch
3) Make a complete turn on one of your edges, think smile
4) Try and get as much angulation and inclination as possible
5) Go very slow
The goal is that you will fall at least once. If you don't you are not getting enough angulation or you are going to fast. It forces you push the limit of your balance on the edge. Apparently this is on the CASI level 2 test, hence I am practicing it.