Having looked into some of the lore a bit more (not all of it, mind you), the Galactic Empire comes off as strangely Roman sometimes.
The way Palpatine holds power on the shoulders of the military whilst giving lip service to the Senate is quite reminiscent of a "Princeps Senatus." At times he resembles Augustus more than Satan.
"High Human Culture" seems to be an attempt at implementing an overarching culture for the entire galaxy that creates a more united and stable Empire (Palpatine was trying to crush multi-culturalism, lol).
And whilst it practices slavery, it seems to be more of a system of battle captives than the full blown chattel slavery of the antebellum South (or what the Hutts practiced).
Taking such things into mind, if you wanted a more nuanced portrayal of the Galactic Empire, drawing further inspiration from the everlasting glory of Rome might be a good idea.