I think the point is clear concerning whether to mix elevator and flaps on the first flight then. Given the fact that there are variations in what is actually needed, some need it some don't, that it's better to first see how the plane reacts before adding mixing to the equation. Just imagine the angst if you've mixed down elevator only to find that what you thought would be a home sick angel has suddenly had it's wings clipped! Too much to worry with to take on that nonsense as well!!!

Happy landings!

Mark