It took me a while to get used to throttle control on my first 4wd car. You have so much control of attitude since you have 4 tires under power and a lot of motor. It is all about throttle control in the air. You can not let off the throttle in the air (especially if you have drag brake) because the nose will drop. You should also not have any trouble getting the nose up by using some throttle inputs.

I would do what others have said on here. Go to the box set-up as it is very good and practice driving it. You might also give your car to an experienced driver and have them wheel it around the track. If they have troubles, then you may actually have a problem, but I don't think it will be the box set-up. It would be more likely to be an ESC issue regarding throttle and brake settings.