Well, you should have added time dimension (in your description) to those state gifts. All levels of gifts still give only +100 to relationship. But that's max. Giving another 2,500 gift the very next turn will just boost the "state gift relationship factor" from its decayed value of 98 to 100. So, you'd just have bought +2 to the relationship for 2,500.
Giving more state gifts only makes sense when the "gift factor" has significantly decayed.
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