I have found for me that the jumping the car can be affected by a number of things but the main part is the suspension if the front is to soft when you hit the jump the front will compress making the nose of the car hit the ramp and bounce up into the air and as you are accelerating up the jump makes the back want to out accelerate the front making the car go nose high. having the suspension to hard can also cause this as the shocks carnt react to absorb jump and packing up ( no or not enough movement in the suspension )
this can be solved by going up or down 5wt to 10wt in oil what you are currently or even a spring rate I have found that ae red 3.9, kit 4.0 or losi black 4.5 springs on losi 37.5 to 42.5 has the best feel for me with outer hole on flipped wishbones and centre on shock tower.
I hope this helps.
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