When descending yesterday I was cutting it close on battery life, so I was pushing it (manually) on my descent. I noticed the craft shakes and fights more than usual for stability when going down at a higher rate of speed.. I experienced this at around 3-4 mph vertical drop at 0 horizontal speed. Is it safe to go that speed during descent? Can I go even faster? What is the absolute known safe speed while landing? Is there a better way to get to the ground fast instead of going straight down?