The fleet in the save is clearly not focused on combat, but rather campaign speed, stealth and sensors. To be honest, it looks like a reasonable fleet for smuggling or stealth missions.
you nailed it! Its a fleet built for smuggling marines into colonies, not for conquering chicomoztoc.
Idk if u noticed (or if I had done it by the time I made that save) but I've named the variant for all of my ships, "stealth" lol I'm building my fleet to, call in pirate invasion fleets against main faction colonies with 0 marines, slip through the warzone, help the fleet with the starbound defenses if need be (I put fighters on all my support vessels so I can have all my freighters & salvage rig help kill stations if my allied fleet doesnt manage it. its a sight to behold, a salvage rig attacking a starfortress lmfao) & do lightning strike raids against the planet then leaving & letting the pirates capture the colony.
And in the process I've pretty much confirmed that my issue is 1 part that my fleet isnt built for pure combat the way a lot of the AI fleets are (which im fine with, if I wanted my fleet to punch up I wouldnt be putting sensors & insulation on every ship lol) & 2 parts expectations. I've joined enough allied fleets in combat by now (sometimes even just with 1 kite to slip torpedoes into the backside of the enemy's most important capital and then leave) to get a view of how the game expects itself to be played with the changes to the meta from when I locked into my playstyle in 2017
& yeah the reason the guns on them suck is bc I havent found anything better. I have a mod that makes guns not spawn anywhere outside of friendly military markets & Im hostile with every faction so :shrug: not my fault I have a destroyer with 3 burst lasers. My playthrough is way harder than most ppl's
also, RE putting insulation on my frigates, I was just looking at that, I literally noticed the tooltip says only the biggest 5 ships matter like 20 minutes ago & have yet to confirm how much of a difference it makes -- bc even tho it says ONLY the biggest 5 should matter, pulling insulated engines off of my kites still seems to make a difference