How to make 2D-trampoline

[ekeimaja]

So I am now making 2d sidescroller, where player can jump with trampoline. But I cannot get it working as I would like to.

I made it like this in Physics Editor: 

But because of using material, which enables bumping, it makes like with arcade physics. (RED IS SHOWING AREA WHERE I WANT IT TO LAND.)

So, is there any solution to this? One possible is to cut that jumping area half, and put it together in game with constraints.