It probably is enough. As far as I observed it, only the player with less boredom unhappiness of two players gets this modifier on the other one, with a straight percentage per point of boredom unhappiness. The multiplier seems to depend on global game variables (difficulty, map size...), it is the same for all players (again, as fas as I know). In my current game it's 3%, in yours it's 3.75%.
Thank you, I didnt know that.
In this game I am going to win with diplo within 7 turns. However, I need to pay more attention for this in other games. Especially, when the tourism leader is also leader of culture output because it means that he will be the one who has less boredom -> he will receive this (sometimes quite huge) Tourism Boredom Modifier.
Thanks again.