Great content here. The content is great and really helps focus each of the NPCs more solidly in their role than the base.
And, to take nothing away from the mechanics of it, really the gold for me is in the sidebar for each NPC. It's great to have the adjusted numbers and mechanics but the descriptions of *why* and the design philosophy for the changes and especially the sort of game plan for each NPC really helped encounter design click for me.
The grunts are fantastic too btw! It was gonna be overwhelming making grunt versions of most things and I totally agree with the NPCs just not being well suited as chaff. It's easier to throw in grunts now and I especially like how they're suited for their role while being easy to use.
Just fantastic stuff overall, really happy with this.