I think you might want to look elsewhere for analogs to your designs, perhaps something similar to the following:
ELINT/SIGINT ship, modeled on USN AGER-type (ex. USS Pueblo, AGER-2). Basically a small cargo/personnel transport equipped to collect intel from enemy communications. Minimal armament (machine guns). X-wing stats: start with ORS YT-1300 stats. Consider giving it HWK-290 maneuver dial as it usually has no need/capability for high speed/maneuverability. Attack: 1 or 2 max. At least one, maybe two Crew slots (Intelligence Agent and Recon Specialist seem appropriate). One or two System Upgrade slots (any of the published ones would work). In-universe, this ship would hang out, just out of defensive fighter range of enemy/neutral planets, collecting info. In-game, this ship would be more of a target/objective, not really a useful/desirable combat vessel- "Rescue the Intel Ship" scenarios come to mind.
Surveillance ship, modeled on USN T-AGOS type (ex. USNS Victorious, T-AGOS-19). These are, ostensibly, ocean surveillance ships equipped to gather underwater acoustical data (they are also incredibly capable platforms for detecting and tracking submarines!). Minimal to no armament; their survivability rests on being "civilian" non-combatants and rarely operating close to shore. X-wing stats: similar to above but I would go with something closer to the ORS YT-1300 (I'll explain why later). One or two Crew slots, one or two System Upgrade slots, one or two Modification slots (ala Imperial Guard TIE/IN). In-universe, this ship would rely on stealth and powerful sensors to shadow Imperial fleets, gathering intel and tracking their movements; when threatened, ship would use superior speed to run for it. In-game, this ship would, again, best serve as the focus for a scenario or could also be forced to make a "fighting withdrawal/escape".
Radar Picket, modeled on USN DER type (ex. USS Durant, DER-389). WWII era Destroyer Escorts converted to Radar Picket ships to provide early warning of incoming attacks, allowing time for defensive measures to be taken by the fleet they were protecting. Armament varied but focused mostly on anti-air. X-wing stats: start with ORS or named YT-1300 (I'd go with latter as this ship will be sailing in harms way!) One or two Crew slots and one or two System Upgrade slots (in lieu of heavier armament). In-universe, this ship would be an out-rider of larger fleets or perhaps as a scout, helping to coordinate defensive actions. In-game, this ship should have some capability (Upgrade, Crew or text ability) to improve the performance/capability of friendly fighters (something like "give any friendly ship a free action or target lock" or "one friendly ship within range has its PS increased by 2" or something like Draw Their Fire , the ability to pass actions/TL between ships or something similar. Again, this ship would make an excellent point of a scenario!
I'd look at the upcoming Rebel Transport for some useful Actions/abilities. Also, consider a Astromech Droid slot in lieu of a Crew or Upgrade slot on a design, just to mix things up/make a design distinct from the others. Likewise, one of your designs might have the ability to have TWO Modifications.
As for the "Repair Barge" and it's in-game repair abilities, I'd drop the idea as written but look at the Rebel Transport and some of its abilities- i think one of them allows the ability to reinforce the shields of friendly craft within 'X' range. If not, consider creating an Upgrade card: Shield Booster-"increase the shields of one friendly ship at range 1. Place 2 shield tokens on the friendly ship; remove any remaining, unused shield tokens at the end of the turn".
FYI- the YZ-775 Medium Transport was a larger ship than the YT-1300 and similar Light Freighters, so I'd expect to see a bit more Hull than the YT-1300 but you could make the argument that bigger is not necessarily stronger. Likewise, it would probably be slower and less maneuverable than the YT-series, so I like you choice of the HWK-290 dial (perhaps even the Lambda shuttle?).
Also, I'd consider changing the name of some of your proposed ship types. "Satellite Barge" is really a misnomer and rather confusing, as there are no "satellites" involved anywhere (unless its function is to deploy/service/collect intel from such satellites), nor is it a satellite of anything (AFIK). It this is an in-universe name from some source, so be it but otherwise, I'd give it a new, more accurate/meaningful name.