A bit of feedback...
Firebirds: These little guys I keep wanting to nerf because on paper they seem so damn powerful. But I keep trying to look for a weak point in their balance somewhere, and I keep not finding it. XD If you can give me an excuse to nerf them, I probably will, but for now yeah they're damn cool.
Overclocked fighters: They're mostly supposed to be budget options, but they're also partially novelty items so I'm not too bothered about that. The main reason I tried to spice up their weapons from their base fighters was to keep them as sidegrades rather than straight downgrades. When you say Overclocked Trident, do you mean Dagger?
Rogue: I agree with your concerns about a fast HE fighter, but I'm also quite confident in the Rogue's balance measures. It recently got a small buff, but with a corresponding increase in OP cost. While it isn't a true Interceptor it really falls into the same role as the Thunder does (and matches up with it very well in fact).
Warhammer: All sounds about right for what I wanted from it.
It's about as un-super as I could make a superfighter.
Mirage: Awesome, making a ship that's fun to fight is always an achievement.
Trebuchet: Hehe, yeah I might nerf it further at some point, the early game raiding is damn strong with it.
Prophecy: Sounds about right for this one too, it's mean to be a dedicated escort boat, more-so an Omen alternative than a Scarab downgrade, but whichever works for you. (The Mk.II is definitely a straight upgrade, it's supposed to be a sort of mini-boss pirate ship, and salvaging one should be considered a reward to the player.)
Acanthina: Hmm, wider turret arcs aren't a bad idea. The M version might seem a little underwhelming, but I'd rather not change that since missile frigates are tricky to balance. The pirate version is just a pirate version, doesn't have to be particularly clever.
Quoin: Glad the balance is working out. I wasn't rightly sure how to make a heavy frigate for high-tech, but I think the Quoin fills the role particularly well. I'll see about shifting the variant weapons around if you like, but it's not a major concern for me - personally I'd rather have my high-flux weapons in direct control and low-flux on an autofiring turret.
Brawler Mk.II: Weird little bits of minmaxing you can do there with Ill-Advised, yeah.
Still, that sounds like it's about where I want it in terms of balance and role. By frigate freighter efficiency, do you mean using Repurposed Fighter Bays?
Gladiator: Also exactly what it's supposed to be. I'll think about the composite mount though.
Insurgent: Yas, she's a fun ship.