this. but stepping is a bad habit. Even though it will get you lined up on the rail a lot, If you always step, and can't pop onto urban style rails, then it may get you into trouble when you actually go urban...it's happened to me before.
but yeah, just try to find the right angle. that's all I can really say. The more practice, the better you will get at doing it. Everyone hits it at a bad angle once in a while. Just repetition.