When attacking drachonian base, though my fleet is mostly undamaged, I loose because of time running out! This time issue is only for the left side (see below screenshot) Often my fleet moves like it's stuck in mud, which seems part of the time issue. Only giving 5 minutes for the attack seems unreasonably short!!
You have 3 solutions to this issue:
Punisher Mk2's thrower can hit underwater and deal with the mines. Equip one ship with sonar and that can do the targets easily.
Gladius/Reclaimer fleets need to have one ship refitted with sonar special and one weapon that can hit underwater (like a depth charge)
Ditch this target completely and just auto base part depots. They're easy enough with reclaimers and damocles fleets