IMHO its just too easy to gift factions to improve relations. Pope or otherwise.
My suggestion is to decrease the effect of gifts each time on improving relations.Say by a factor of 25% less effect on relations each gift.
Discussion,
Worry about the Pope?, don't ; 100flx100 turns will let you forget him.
Worry about poor relations with your neighbour?, don't; just give him a good gift and your relations will skyrocket and you can get peace easily.So instead of 100x100 for the Pope I would have to do say 100, then 125, 150 etc to get the same effect.
Related issues
I also mention in passing that your reputation is also important in this, but I don't think retracts from my central idea to reduce the impact of each successive gift with time.
Tribute also poses an implementation problem unless you just reduce the effect after every tribute period.
I leave the thread for discussion.
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