Im in the same boat! I tried it and tried it and tried it 20 more times. Each time it was a different number. Finally I just at it until I got a consistent number for that spot.
It didnt like angle 1 as i set the trans level. Had 2/3 green then when i lowered it with the wheels on it accepted it.
Was just a pain going back and forth to find the happy spot.
If the app suggested the last measurement it would save a lot of bs. Then you could dial it in to top or bottom of the parameter.