Tried TO on grass and concrete. Backward movement about the same as my smooth white surface--18 to 24 inches. Tried with auto TO, there was only about 6 inches of movement, much better than with the manual TO I experienced before. But I...
I also have a mini 5 Pro and new RC2 that came packaged with the drone, and I wondered about some of the same things you noted: Lifts off very quickly, and then goes backward a few feet (maybe due to the pitch angle of the drone at lift off)...