Very interesting. The radical increase in alpha during the hypnosis session is remarkable, especially as it comes with such a intense decrease in all other power bands.
I'd look into a few things to ensure the readings are trustworthy. First I think replicating the experiment would be very interesting to see if you get the same results. An effect this dramatic begs for a replication.
Secondly I'd look into the headband placement. I've noticed with using the Muse is that the position of your head and how the headband is placed there can have a pretty dramatic effect on readings so I'd look into that as well to ensure the observed effect isn't due to that. I'd repeat the experiment with the head in the same position if that wasn't the case previously.
I really like the experiments your conducting. I hope you have a chance to share more of your results as they come in.