Can you offer some advice re: Flashbacks? There's not much to go on in the rules. Do players tend to narrate just one per session (assuming a session = a one-shot)?
When you say "illuminate a character's past" does that include mundane topics like "That time I went grocery shopping and they didn't have the melon I was looking for"? (Hey, we're learning that character likes a specific kind of melon!) Or are Flashbacks supposed to be relevant to the character's Trouble or the current Bounty?
What about trying to come up with new Flashbacks for the same character over a long-term campaign? That could be a lot of "past" and "motivation" to wring out of one character.
So far, my group hasn't been interacting with the Flashback mechanic, and I think that's because it doesn't seem to have a direct impact on the narrative surrounding a session's current Bounty, where all the action is.