When you approach, the riding line you take onto the C feature has to match it. Meaning if its curved one way or another, ur line into it has to be similar. Approach at a wrong angle and ur off either side. Next, the feature is non horizontal, so u need speed to stay on. No centrifugal force and you'll slide off. Last thing, keep you eye on the out. Yes I know its a curved feature, but it helps to keep you locked on.