"It's inherent in the way Flight Simulator works. Not a lot can be done about it without detailed tweaking of each airport.
Basically you have to try and have a node just a little down the runway from where planes reach taxi speed. Then hopefully there is a taxiway exit further down the runway which is closer than the one behind.
FS AI aircraft will turn go to the closest node when they reach taxi speed. If it is behind them they make a u-turn. The aircraft turns based on the radius set in the model file - which usually means turning into the grass.
On some airports you can fix this with a lot of work. On some airports it cannot be fixed because normal procedure is to back taxi."



Ok try this, look and see where the aircraft is turning around at and at that spot put in a taxi way. Insert the new taxi way right at the turning spot see if that will fix it .Just maybe we can get the aircraft to use it . Does all aircrafts do this. Try landing them on another runway and use this one only for take off.
I'll keep looking.