I'm not particularly a fan of having stations in civilized space fighting alone. I understood it with the {REDACTED}, as they could easily be having cognitive issues due to age and isolation and whatnot, but the major factions having a station fight solo makes me twitch a bit. Not only because the obvious response to a solo station is long range (I mean strategic map scale) KEW. The point of having a strongpoint like that would be a safe place for a garrison and system patrol force to retreat to, to vent, to repair, to resupply. I'd expect that someone picking a fight with the home base would have a number of ships to face down who were simply around the station. The ships resupplying, refueling, taking on ammunition (obvious place for D-hull ships from battle damage, perhaps they have half ammo, lower starting CR, whatever) would probably have crews that'd object to their home getting blown up and looted to the bulkheads. In addition to any dedicated ships, of course.
This would naturally complicate the fight, but in a good way. The station's obviously a fountain of hurt, and the fleet can pounce on any weakness shown in taking on the station. Having a fleet coordinate with the station would probably not be too hard from the back end; place hidden AI escort markers on station modules (light/medium/heavy depending on value/vulnerability), and have the escorts prioritize ships attacking those modules. Though obviously having the ships hang out too near their escorted module runs the risk of them accidentally meatshielding for the enemy. A higher level station could also have a bigger garrison, allowing there to be something of a normal fleet battle in addition to the station playing 500 pound gorilla in the middle.
This has two benefits - first, that you can relax a bit on making the station capable of credibly solo-fighting an entire fleet while being, well, stationary. Second, no need to make new remote defense platforms since you've already got them - the ships.
Just my two cents, lobbed in from left field. I look forward to seeing how it all shakes out.