I have mine set to 12 so I can use the flak guns in heavier weather. I use the 'Big Waves' mod, and I just don't use the deck gun if I can see the waves washing over the deck.
The biggest downside is that the 'oilskins' wet-weather clothes are also governed by the storm state, so I sometimes end up with heavy waves and rain, and the crew dressed for Martinique!
