You can see my
github ticket here.
@bigcat88 demonstrated, to my satisfaction at least, that the pillage bonus is operating by different mechanics than we are used to.
8-19 only changed one building, the Observatory, so everything is up to date with the changes to Intihuatana:
1 Scientist ==> 2 scientists
2

==> 6

2

for every mountain in 3 tiles ==> 1

every mountain in 3 tiles
So this affects Intihuatana. I didn't feel comfortable with making the base science yields that high on the inti, so this is what i did:
Intihuatana unlocks at Theology:
1 Scientist ==> 2 scientists
2

2

==> 2

2

2

2

for every mountain in 3 tiles ==> 1

2

every mountain in 3 tiles
On unlocking the Observatory policy:
2

2

==> 6

2

1

2

for every mountain in 3 tiles ==> 2

3

every mountain in 3 tiles
I'm not aware of an updated modpack which includes 4UC,
@Wasteland_Wanderer's
July 5th modpack is the most recent one I'm aware of.