I can tell he's focusing on character development heavily still, meaning it will clearly get to a point where the MC will finally begin to calm down a bit mood/attitude wise, but I think we won't see that show up too much until likely another two or three episodes/chapters down the road, which for me, is a logical, fitting and thus good pace for that.
That said, I would like to say to me, I've already noticed a bit of that "toning down" you're referring to across all the characters, actually. It's subtle, and small little bits, but it's definitely present. And to me, again, that's just the right pacing to have for the toning down, specifically of the more intense characters like Ash & MC.