Surprise, surprise.
I did not change a thing. Just came back from a flight with the QW787-900. Result: in the tanks: Left 2,600 kgs; Center empty; Right 2,700 kgs.
I decided to top her up until 50,000 kgs in total. That means 17,433 in both wing tanks and 15,134 in the center tank.
Now refueling works like it should (at 10 time the speed as in the Settings).
Could it be, that when the fuel to be loaded is just for the wing tanks, so below 34,866 kgs minus what is still in the tanks, that this slows down the refueling proces?
In fact, that was exactly the situation several times with flights within Europe.
Dirk