GWX could make a little difference, simply because wet-weather gear is directly tied in with gun availability at different storm levels. It has been tweaked so the deck and flak guns are available at higher sea states, which means that they also don't dress for the weather at those same states.
Unfortunately it's either one or the other. But still, those states are not near the highest (11 I think is where most are set now, rather than 7 as in the stock game), so I would first follow Myxale's advise and rotate the crew.
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