That rep level isn't too hard to get in the new game.Yeah except they don't beat on other pirates in the employ of a noble house. Plus the whole +15 more rep for Steiner and Kurita versus a new campaign start when I can't recall ever doing missions for them. I would have taken any Steiner contracts I found but not Kurita given I favor Davion, and the only reason I have Liao rep was because I was actively at war with the Taurians and took a few missions with them to punish the Taurians for their war crimes.
I mean logically I can see an in game reason for a boost in rep after you finish the campaign since you did basically restore a noble house against an unlawful and somewhat barbaric usurper, but the rep in that campaign save certainly doesn't reflect the actions I took during the whole campaign without some sort of a rep reward with everyone after you restore Arano.
Maybe you might have been at zero and taken some pirate missions without realizing it?