Ok, that makes sense.

But how about with these eastern Seleukid cities I am conquering? I can't see the people in those cities having more loyalty to the Seleukids than they do to me, especially considering that I am much closer. Remember the reason Baktria seceded was because they had to fight of nomads in the east (Ambition played a role too, of course), and the Seleukids weren't really doing much about it because they had troubles elsewhere. I would see these eastern cities flocking to my rule because I understand them and their struggles, and am not far removed like the Seleukids in Antioch.

I would think this would mean I could go straight to a level 3, if not level 2 government with these Seleukid cities.

Now once I get to Persepolis and west of that, I could still see going to a level 3 government, as these cities are used to being satrapys under a Greek ruler.

Anything not Seleukid, however, and I will probably just give them Level 4 and then upgrade slowly.