I'm running a Carronade Goldfish since the Flak was changed, and while sometimes wondering if the weapon wasn't a bit too strong, I never found it weak or useless. I'd even say it's very well balanced - You can bring your enemy in a horrible position with it once you're above them, but have your gunner miss a single shot, or the enemy captain be smart enough to throw in kerosene or moonshine to move trough under your ship, there's enough time to get the balloon repaired and fly up higher than the carronade-ship with a quick use of hydrogen. It also effectively allows to cripple other ships to buy time for an allied ship to arrive or repair, I'd have it stay as it is.