instead of looking at the end of the rail like you would with a normal switch on, focus on the ground other side of the rail (left ground if you spin left, right if right) and itll help you bring that rotation around.
start whit the baseslearn a sw 360 on the smallest jumps , and try to get a good pop out of it . once you can do a sw 360 perfect , keep that same feeling and do the same on a rail.