I never had an issue against the Carronade.
What people don't seem to realize is that the Goldfish is a one gunner ship, meaning...you can shoot everything off the goldfish, but if that gun is still on, it's gonna keep shooting....unlike previous Metas...such as Pyramidions or old Carronade - Flame Squids, where if you blow everything off those ships, they lose their fire power quite effectively.
Have I played against Double blenders? Yes. Have I got womped? Yes. Did I beat that combo, too? Yes. Fun thing about the heavy carronade is that you can shoot out the other heavy carronade, which should be the priority first since that will give the enemy blender no offense for a few seconds, force an engineer on the gun perhaps, and you can take out that balloon before that carronade gets back up, just in time for you to shoot it out again.
I've beaten double blenders with a Lumberjack (hit them hard before they get to you)...mines...Carronade-Flame Squids, heavy gat-mortar/flak pyramids....
The reason why you see so many blenderfish, and this is in my opinion, is because we still see a lot of close-range brawlers, even though they gave the mortar a max-distance, I still see a lot of gat-flak Pyramids, and a Blender (or a Carronade-flamer squid) is one of the easiest things to use against those. Since they're going to be upclose and personal, you'd want a ship that can be just as up-close, and more maneuverable.
Other opinion is because I don't think many new pilots know about different engagement lengths and what suits best, or that even those "sniper" weapons with arm times can be just as up-close of a combat weapon with the right gunner skills...but probably the first as I still see a ton of new pilots treat a lumberfish as a battery-ram...
....
They could make it so the Lumberjack has no arm time again~ that can be your counter~