First of all a Manticore equiped Goldie is not a Pyra counter, it's just a disabler ship with the same effect any ship is hits.
Also, ideally, you want to be above a Pyra since its long nose prevents their guns from shooting at you, go below and prepare to get wrecked cause of the massive arc of both the flak and gatling. Trying to circle then with a Goldie when you don't have ally support won't prove to be effective since with their piloting tools they will be able to keep their guns on you.
If you can kill a Pyra using a Manticore fish and that alone, your enemies are probably horrible, hence the whole arguement about countering the Pyra is kinda null, since a counter should be a counter even on higher level play to be valid and also apply on an equally skilled enviroment.
Of course, Chute vent helps with avoiding their rams, but any decent Pyra pilot will probably just use Kerozene to break rapidly and just watch as you go down while their guns can still hit you, unless you time it extremely well.
It's a battleship, basicaly, it brings brute strength on the field, it's not OP by any means, it's slow turning can still be taken advantage of as it is very vulnerable to flanking and focusing since it can't accellerate fast. Still, just like the basic fighter classes in RPGs, the Pyra is simple and easy to play and understand, hence why it's so popular.
Right on all accounts, but you're looking at it too generally.
Yes, Disablers gon' disable. This is just a specific disabling strategy to disable a headstrong pilot/captain flying a Pyramidion. Not to say being headstrong is bad, (I consider myself quite an aggressive flyer) it's just common, so it's good to be able to thwart the specific tactics.
Ideally, on a fully operational Pyramidion, yes, you do want to be above it. But if you've got a decent gunner, they took care of those front guns and their turning arks. Then you pull the carronade on them, putting some serous damage on that balloon. This pulls one of the combat engies on the top deck off repairing his gun and on the the balloon. Fortunately, the port-side front gun is the one that will be abandoned to repair the balloon, and because the captain will probably be turning to port to get his port-side guns on you, you don't have to worry about the gun in that position too much.
Good communication thwarts this, but Manticores cause a certain panic on most ships that is replicated by few other weapons.
Because you haven't hit them with any piercing damage, their armor is likely still up, which is why I suggested you let your ally come in and finish the kill. This is actually preferred. By "Finish your own dirty work (if you aren't running a completely disabler Goldie)." I meant that you have a starboard Gatling Gun as opposed to a flamer, carronade, or other disablement/harassment weapon. This gives you a nice piercing/explosive combo because the Whirlwind and the Hwacha actually have a little sweet-spot crossover on the Goldie. Once again, less preferred, but still might be effective.
Despite the sheer amount of words and explaining done in the two posts, this is no where near a Cogs-level battle plan, just a fun way to try to take out a few of those pyras other than Gat/Flak them before they Gat/Flak you.
Safety and peace, my friends!