I keep thinking that building ginormous commercial engined battering rams might be a decent idea. Give them a ludicrous amount of armor and box launchers, basically no engine. Standard transit a pile of them in. Eat death for a while. Then blow everything straight to hell.
Ships are expensive, lack strategic mobility, and will take losses. But you don't need to research and build military jump drives, which are obscenely expensive. I wonder if the math works out?
I also wonder about parasite transit rules. If a carrier transits, do its fighters suffer jump shock?