You may not have seized control of all the Watchtower stations - once they're free of the AI-protection, the towers can be snagged by anyone and everyone, and they have a pretty good view range. AFAIK the station can't IFF on its own, it just takes targeting data from the towers, so if the pirates sniped one of your towers and it's feeding data to the tower that says you're hostile...
Yeah.
Speaking of which, man, the artillery stations are cool, and really well-implemented. Enough so that I thought they were a new vanilla feature I'd missed. I'm kinda surprised there isn't a giant eff-off laser option given the ranges involved and the fact that lasers travel at the speed of light, but the sheer idea also fills me with no small amount of dread because they'd probably be the most dangerous of all unless you could maintain a good parallax velocity relative to the station. As it is, I find there's an interesting balance to the existing trio of them;
- Mortars are kind of anemic on the starmap, but utterly terrifying in close combat. Their charges just annihilate any kind of fighter cover whatsoever, and are an extremely hard counter to carrier groups unless you can shoot the shells down before they detonate. Which isn't easy.
- Railguns are of moderate concern. Their burst volleys are kinda easy to avoid, and they seem a little anemic in close combat.
- Missile stations are scary on the starmap and reasonably dangerous in close combat. Those missiles are persistent as all hell, and getting interdict-pulsed is rough if you're deep in enemy territory. Great way to get caught between Ordos. The brief overload pulse they do in close combat is nasty too, but the platform itself can be overwhelmed by fighters to the point where missiles detonate just after leaving the rack, so they're not as dangerous as Mortars (in my experience, of course).
I can only imagine a laser platform would have to be approached in a spiral pattern and then unleash enough firepower to casually melt anything smaller than a cruiser in close combat.