No films for examples, No specifics (Heights, speeds etc).
Guys you need to support your bug reports with some detail. Who knows if you are attempting to take off a high Alt field with obstructions or whatever.
I would put money on it that some of you are pushing the envelope too far and distracting from a genuine problem.
NOE flying for a formation is all well and good so long as you don't cut it too fine. Certainly your take off needs to be normal to get the formation together at the start. Turning too tight and loosing a drone is just bad flying especially if you don't cut the power back to let the outside one keep up! Other than that, irrespective of speed, you can simply turn too tight and loose drones.
I would suggest you record all your missions so when you have a problem you can edit the film to show the problem(s). Leave a couple of minutes of OK flying either side of the problem so it can be seen how the problem developed. You don't need to save the films when missions are bug free!