The only other non-abusive ways of doing it are the Cabinet NI and releasing vassals in some of your poorer land (although you shouldn't've conquered that land in the first place). As a general rule if you find yourself riding the infamy limit the question isn't so much "how can I reduce my Infamy faster" as "why did I hit the Infamy limit in the first place?".Right forgot about that...
Anything else? How do you guys who are experts manage this?
Edit: Also there are some HRE related modifiers and some national decisions which either increase or decrease it, and having cardinals (as a Catholic nation) reduces it by .1/cardinal. The cultural decision "support the florentine school" also helps a bit.
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