Giving the Gemini the flux stats and armor it would have with Militarized Subsytems, plus placing it on par with the Mule in speed is all the Gemini really needs, and it will be a good counterpoint to the Mule. It has two forward ballistic turrets and a large missile hardpoint, giving it decent long range supression ability, but it can't get into any furballs because once the fighters are gone, it has only an omni shield for point defense. It's a fundamentally better support ship than the Mule, which has better skirmish capability than the Gemini thanks to maneuvering jets.
None of these are really going to perform well against a fleet with a couple overdriven Brawlers, but that's a given.
It would be nice to have an area of play where using these subpar ships might be possible, but that's a big ask. All I want is for these ships to be strong enough they aren't purely a resource drain in combat.