As for the 400 experience points for Utar’s quest, it includes: a battle with Utar himself in the dungeon, arriving at the settlement of sufferers, helping Mahra, a story-driven battle with the ice flesh, staying in the settlement of fighters, an event with a storm, and a battle with the rector. There is a huge arc here. It fully justifies its 400 experience points.
And as for the increase… Yashur, do you even see the difference in when you got it? You received it MUCH earlier, and your character also has more influence. Aristarch confidently leads among the characters. Yes, not in terms of stats. But stats are a separate topic for experts