I am happy with most of the rules changes I implemented. Search Warrant and Immovable Rod haven't come up yet, but seem potentially cool. Ouija Board is a sorely needed modification from spirit search, IMO. Looking at town trying to get a group of 4 together to use one today, it seems like the larger groups for spirit searches are clearly just way too inconvenient. Also, I like that it is weaker early game, but actually still relevant in the late game.
Seer I think is a fantastic role, in that it fills a niche where roles didn't exist previously (e.g. it isn't just another variant on investigations), but it still feels fun and relevant, based on my perception of people who have the role. Conspiracy theorist might be a bit weak, but I guess it probably isn't weaker than roleblocker. Gay knight it's hard to tell, because the only pair this game was mostly inactive.