Well in the end I am gonna say that Operative Overseer with Servo Skulls isn't bad but it also isn't good. The main appeal for Overseer as an Operative is Strategic Adaptation for an extra attack but the AP refund and extra attack only works for single target abilities which is the exact opposite of what you want with skulls since it lets you aoe expose weakness then aoe analyse for debuffs then trigger tide of excellence against a bunch of enemies and autocrit all of them for 300-400 damage thanks to precise attack assuming you are using a heavy weapon. The aoe does great damage but there's no payoff for any of the talents or abilities for Overseer, might be worth doing as a non-buff psyker but there's just so many wasted talents and abilities and you need chaff to scale off of for Fortress World.