However, I tried sending a fleet of 6 of these ships, and my special Ordo Farming Doom and Paragon to fight a Remnant Ordo with 3x Radiant using the usual tactics of defend order on Paragon. They just get slaughtered by the Radiants in fleet combat - they actually deal good damage but are extremely vulnerable to getting flanked by mobile opponents.
A) The ship is vulnerable to being flanked, yes. Give it escorts rather than trying to force a monofleet.
B) It's made of paper. Why would you stick short-ranged Storm Needlers on it? Put those on something that wants to close, like the Prometheus Mk II.
I've had quite a bit of success using them as artillery ships, armed with 2x Squalls, a Haephestus, a Mjolnir, and some PD. Pair them up with some more maneuverable and tougher ships to force separation, and they'll wreck ***. Best used with Blast Doors and Containment Procedures, though.