Nose up?

I had a lot of fun with the nitro guys on the track during a practice session a week ago.
For some reason, on most jumps my Truggy raised the nose up way to far and I had to level it using the breaks. Something might changed on
my setup w/o my notice, could be other reason or failure.
Any idea how to change my Truggy behavior so it will fly level again?
Here is a video of the practice session, my Truggy has the black wheels.

http://www.youtube.com/watch?v=Fv1uH9xVbtc