1) It hops when there are 7 people in your side (including you), or when there is a cannon (if you have enabled the cannon hop option).
2) No, that is strictly att/str/def xp (not hitpoints at all)
I can add a hp xp counter if you guys want, it may take up space however, so I can add a hot-key (TAB key perhaps?) to toggle the HP xp. I will be doing this anyway for my other scripts, so let me know if you guys want this.