Shout Cooldown Scaling Rebalance

I'm looking for a way to rebalance shout cooldown scaling. I've got a lot of mods that add ways to reduce your shout cooldown, and utilizing multiple methods of doing so quickly makes it approach no cooldown, which pretty much trivializes the game. Rather than making a patch to individually change the values, or not getting to use cool options, is there a way to rebalance the cooldown calculation itself to make multiple options still beneficial but not overpowered? Say, changing it to be multiplicative, or add some kind of diminishing returns function?