Other options to Fix" them are:
give them same weapons range as Vorlon fighters - 3" means AF is useless against them and they have to be killed by normal guns - when the shield comes into play. Or you jump them with fighters.
remove the shields and make them more per Patrol point - 4 would be OK I suppose
make the Shadow ships that create them Fleet Carriers - it makes sense (and give the Vorlons a Carrier)
make them have 1 AD each and 6 per Wing/Patrol point to get Matts "swarm"
Make their guns accurate - the White Star in WWE gets hit by them