Stuart, thanks for your feedback. The trigger for blow off some steam, could use some work; but, it's not specifically constrained to when you have time and share something personal. Sharing something personal is a way to blow off some steam and it's powerful narrative stuff. But, there are less gritty ways to achieve the end results of the move. I think it's also important to allow a light game of cards and scotch to trigger the move, where something personal does not necessarily need to be shared in order to heal the stress, or increase a bond, or what have you. Sometimes, just having some fun is, in and of itself, a powerful break from the strain of combat and good storytelling fodder. The three things you've laid out are all things I've seen with this move in play and that is a big part of what this move is about.
Observations:
1) Yep. My bad.
2) Leverage, that's the difference.
3 & 4) The weapons section is undergoing revision, so stay tuned.