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It's worth mentioning that the early encounters in this campaign are deliberately easy. For example, at the salt works, it flat out says the "guards" spend most of their time sitting around and playing cards, and half are asleep if the party attacks at night.
Likewise, with the tooth fairies, it directly states that they're used to easy kills and aren't tactical. I played the encounter that way, because that's how it's written.
One of my party members split u, taking a vantage point on a nearby roof when they were looking for the Devil's Nursery killer. I could have punished him by having 3-4 of the tooth fairies ambush him. Were I running NPCs who were smart, I would have done just that. But I wanted to play the encounter as it's meant to be.
Factor the non-tactical encounters in with the fact that (as others mentioned), you're currently running just one encounter per game day, and it's easy to see how most parties/players wouldn't have a hard time.
I think it says somewhere in the book that you can increase the encounters per day if the party is breezing through. They can always be stopped by dottari or the Chellish Citizens' Group. Or the Red Jills. Or even just a wandering pack of dogs. Adding in a second encounter prior to rest, even a small encounter, can really hurt a spell caster who's used to blowing all his spells right away.
Anyhoo, seems like you figure it all out. Good luck to ya, and keep us updated on how your campaign is going.