Like any jump you need to match your angle to the landing. The problem is that on hips that angle will change depending on how fast, high, and far you go. Also the shape of the launch and how you come off of it changes that angle. It's something you just start super small on and work up.
That's the part I'm stuck on right now. I can go small, and land them no problem. But I want to know the angle the board should be pointing at when I go bigger/faster. So are you saying that the bigger/faster I go, the more of a 45degree angle the board has to be with the landing?
Also, I can go small and land fine going backside air, I'm goofy. I'm still trying to get the hang of going frontside, it still feels a little weird.