I think it is the driver's problem.....as you can see.....in the first part of the video.......the car jumps really great.......
but in the later part......the car jumps & bumps a lot......I know the video just want to show you how strong is the car..... but it also show you if the driver's technique is not good enough......still sucks.......
"舂頭 or not" is depending on how you control the throttle when your car is in the air. It's about the weight transfer of the car after leaving the jump. If you want to nose up, apply your throttle gently once the car starts leaving the jump