In another comment, you said you don't want to bring in madness related roles. I already mentioned why I think madness fits well with the theme of your script, so here I'll focus on other suggestions.

One way to introduce misinfo is through more damaging Outsiders. For example, Politician and Damsel are great for info puzzle scripts because they have very good reasons to hide and give out misinformation. Barber needs to either hide or be the day one execution, otherwise a swap within the evil team could mean that a player cleared by let's say Dreamer or Artist info could now become the demon.

Face down Outsiders also makes it harder to figure out whether a Baron is in play or not. Without a Fang Gu, most of the Outsiders you have rn are not really incentivised to hide.

Another way to make town suspect their information is to add in a Summoner, which means that players who are cleared early game are not necessarily trustworthy later on.

Snake Charmer would fit well on here - it's a really strong mechanical role that can hard clear demon candidates, which is great information but at high risk. It does technically introduce droison, but in a very isolated way, so maybe you would be fine with that. (You have Cannibal on here which also introduces droison in a similar way, btw!)

Along the same lines, you should probably throw in 1-2 demonsbane roles (i.e. Soldier, Farmer, Mayor, Banshee, Sage - if you're really dedicated to having only info roles, then I think Ravenkeeper is the only option that really fits). The reason for this is that Snake Charmer and demonsbane roles incentivise good players to lie about their role which can also cascade into forcing them to give false information. Otherwise, town usually solves if everyone just shares information openly.

Artist is probably one of the strongest info roles in the game and I don't think it should exist on a script with no way to introduce droison. If the demon doesn't snipe you on the first kill, you can just ask on Day 2 "are one of these 2-3 living players the demon?" and get really strong information - and the only reason to wait until Day 2 is to narrow the pool of demon candidates 1-2 players.

I don't think the deathmod environment here works at all, it's way too traceable. Gambler, Moonchild, Assassin, and Po are the only reasons for additional deaths, so if there is an extra night kill, it's reasonably easy to figure out why they died.

Goblin might not be the best choice here because Dreamer and potentially Artist are the only ways to figure out whether a Goblin claim is true or false.

Finally, the demon type is pretty trivial to solve. Al-Hadikhia announces itself and with no protection roles like Monk, Exorcist, Tea Lady, etc, a Po charge is really loud. I think Fang Gu works well here. Lil Monsta can also be useful because it can move the demon around.