Let's talk of Miner Battleship for Very Important Operations.
You are obviously doing it wrong. ALG "Golem" Heavy Mover is a mere transport with a special faction-wise ability to recieve bonus from mining; Salvager is a damn expensive faction-wise analog of Pirate Transport with gunboat turrets and mining bonus since it fulfils quite a lot of roles at different times.
Hegemon is a monster with large amount of turrets and heavy armor. Several of them working in team are quite capable of self-defence even without the additional escort ships, though, some ships hired to secure a mining operation are a pretty logical part of gameplay you may avoid only due to a total greed. In fact, Hegemon got an impressive survivability and usually the dead ones are the ones who went "Ha, you can kill my ship, but you can't kill my honor."
Basically, as it was said, th changes in mining mod were implemented to stress the effecience of teamwork during mining operations; so no gunboats for solo miners; hire a gunboat escort and be happy.