After seeing the goldfish being taken to a few more competitive games, it was pretty clear to me what the biggest problem was: how easy it is to disable the goldfish's front gun. I'm pretty sure this is the general consensus of goldfish pilots. Once your front gun is down, you're a fish out of water (pun intended). Instead of arcing its side guns forward, which would just make a more mobile and overpowered spire, I suggest that a protective hood arcing up from the bottom of the goldfish should be implemented.
First off, there's no way this could be overpowered; the artemis arcs downwards, so any blenderfish or hwacha-fish approaching would have to move in high. As opposed to the hood covering the top of the front gun, a blenderfish can't just go under an artemis and make the artemis useless. I'm thinking the artemis (or caronades, gats, and any other fast shatter weapon) shouldn't be able to hit the front gun head on, but maybe a few degrees above it.
I'm not opposed to any other shielding ideas, but I think this could be implemented easily, and make the goldfish more viable of an option in competitive play again.