Also, just to mention; when you practice this bit, also try to remember that it is the weight of the bigger block falling onto that particular packet, which causes it to have that 180° spin. It is
not necessarily the right hand turning face-up, but rather the natural falling of the bigger block. On the other hand, however, feel free to use the right hand index finger to briefly tap it; meaning you give it a nice kick-start. From there, it's just going to naturally happen.
Good luck with your Molecule Four,
Jordan