I'm not sure about hover vs. moving, but a lot of factors go into the battery life. Temp, wind conditions, humidity, elevation, ground effect, etc. I would say like many product manufacturer ratings, the advertised flight time is optimistic at best. Very cool test however, thank you for the video. It's good to test your equipment like this so you will know the limits.
haha, that was funny.
Another thoght on your circle test would be to use the point of interest feature, let it circle automatically to remove any sudden acceleration which could use more battery.