Yeah there are break points where it bumps to +2/3/4 etc., like you might have to get to +20 total for +3, I forget those break points but think I have it listed on the emotions page. It was one of those mechanics I was proud of the community for working together to figure out early on in TS4
Saved this to my drive, I got distracted by life as per usual but do think I will at least share the list on the emotions page.