Hmm,
I don't think there's gondolas in those tests Niklas, only because they're comparing to a K4 at 3370kg. In the climb charts for the K4, that's the weight corresponding to GM1, without gondolas (mit GM1, ohne Gondelwaffen), right? With gondolas (mit Gondelwaffen) and GM1, it's 3570 kg and without the GM1 (still with gondolas), it's 3450 kg. So it could be that GM1 is being carried in that G6 at 3350 kg. Also, note the max speed is 636 km/h (takeoff and emergency power) and 621 km/h (climb and combat power). Do I have that right?