Skijump ramp shapes - very different to Habsheim
The skijump ramp isn't a flat plane with a sharp change of gradient at the bottom, as that would probably smash the nose wheel as it hit it.
The role of the ramp is simply to rotate the aircraft quickly to the best compromise of attitude and flight path to climb away from the ship. Both are set by the inclination at the top - the profile is just chosen to minimize the stress on the landing gear. The forward speed of the ship then determines the angle of attack off the top of ramp.
This has no relationship with the pre-tree 5 seconds at Habsheim.