First, congratulations on the new car! Regarding the hands free trunk, well, it's nice when it works. I found a trick that works a bit better than what's mentioned in the BMW manual and it is as follows:
Move your foot across the underside of the trunk
right to left and that will activate the lift gate. I am attaching a link to a video
that illustrates this motion.
Hope that helps.
P.S. Video should start at 0:56 seconds. Plus, I did not know how to embed the video here otherwise I would have done so.