Hi there

Very interesting topic, and the first advice I would give you is to remind your players that at the end of the day, the game is set in your Scarred Lands, and that there might be some deviation from the books here and there. I believe it is particularly important if you feel that your players know more about the setting as you do (I got stuck in a theological debate once with a player who forgot that his character did not know as much as himself as a player, and it is an experience I don't really recommend...) I would either ignore or change some details if you find that...