Puppy was going to me my suggestion too, before I read that you’d already used it. Maybe try some of the other versions? If you used a Debian- or Ubuntu-based Puppy, you could try a Slack-based one, or vice-versa. Puppy’s organization is a little confusing, in my opinion, but it does give a user some options. You also might try some of the “puplets” that aren’t official Puppy distros but are part of the Puppy family.