Based on what we know right now, I actually agree 100% with your list here on the backgrounds. They don't need perfect parity (like I think Art still can get an extra point of relationship with Asterion that others can't and that's fine), but I think it shows that Math and Humanities are lagging a bit so far (and Speedrunner is its own thing, but that's kinda the point anyway so whatever).
I did have the Speedrunner event fire by having I think Luke and Khenbish out exploring and it was nice having extra mats, but I then didn't have enough tech stat accruing in R&D to use them anyway, so it wasn't very exciting - not having Luke sitting in R&D being a nerd all day means your tech growth is way slow. Coupled with how the story goes with not being able to trick Argos locking you from the choice of recruiting him over P later (I think), I'm still fine putting it a tier below Math and Humanities who at least don't cause this.
Of course, as you said, this is all min-max optimizing, play what you like for your first playthrough! Expect probably speedrunner, save that for >2 like the devs recommen. :P