i know, i changed the destination node already like mentioned in the manual, but the way how the airplane comes to there is not satisfactory.
Then you haven't changed in the best way possible.
It's not obviously possible to give you more advice without having a look at the scenery, which I don't have, but in general, you should think of the nodes are points through a Bezier Spline can be fitted into (that's exactly what they are) so, you should always be able to find a point where the trajectory will be what you want and, in the worse case, if the position is really strange and/or the scenery AFCAD is done *really* bad, you can always add your own points with ADE, and use those for custom pushback.
Here, an explanation of what custom pushback can do, to replicate a somewhat unusual pushback procedure:
http://www.fsdreamteam.com/forum/index.php/topic,11083.0.html