What do you mean by 'ptf'?? I assume you mean landing from jumps?
Landings are all about controlling your car in the air to make sure you land as flat as possible. Control is usually determined by throttle or brake to level the car out. If you use your brake in the air it will being the nose of the car down and if you use gas in the air the car will go nose up.
Also, how much droop are you using? If you have minimal droop setting your car will bottom out all the time, however if you use full droop your car's suspension will better on landings but the car will feel more lazy through corners at high speed.
There is much more to a cars set up for jumping, but I would suggest plenty of practice and suspension tweeks to get the righ set up - once you have both right you will be away
