You were right - this is really bad. Just get to the speed with the stick and possibly the air break, then move the trim until the app is happy. For me the trim had to be around +4 for the 167kph and +8 for the 102 kph. Not at all what the glider wants. But that’s how I got through. Weird Msft has not corrected this bug after all these months. Tons of people just be stuck there for a looooong time…