What is the process you went through interactively? Regenerate until something interesting comes out and the partially edit it? I'm curious about what you found works.
When the model would reply as multiple characters at once, or interleave narration with the dialogue, I'd usually just play along - most commonly it would decide for 2 or 3 steps to carry on the dialogue just hallucinating the things I would say.
I did a lot of experimenting with different ways to frame the dialogue, from a Zork-like adventure game, to an instant messenger chat, to just paragraphs of prose with dialogue mixed in as if from a novel. I found all of these methods to have different strengths or weaknesses, but the model also tended to blur between them after a few messages so I'd just play along as far as I could each time.