I'll be a little blunt and say that I really wouldn't think of picking up a fifth character yet, as I feel there are some serious issues with your AC at the moment.

I adore your characters, especially the Doc and Hard Harry, but it's quite hard to maintain CR with either from my perspective. I know that everyone has a life, and everyone has days where they don't feel like tagging, that's a-okay. But it's been a consistent pattern for the last few months as a whole, that your tags can take anything up to a week to get a reply to.

I'm sorry if that sounded harsh, and I want to reassure you again that I ADORE your characters, but I felt I needed to say something.