I'm playing with a mod that increases domain limit based on dynasty perk unlocks, and the issue with core limit became apparent when AI characters soon can achieve single heir inheritance by coring all their titles when they aren't yet supposed to. I'd suggest making current held counties as a baseline for calculating core limit, rather than domain limit, as I believe this mod is more about *which* titles are to be passed down to primary heir, rather than potentially allowing all inheritance to be somewhere in between High Partition to single realm heir succession.

Could you add a character interaction for de-designating core titles, as an alternative to the decision? I just prefer self-clicking my character for that kinda thing and having less decisions, so it's a minor thing lol