Sung missions involving Earth Slavers haven't been adjusted to keep up with the significant buffs to this type of ship. This affects the "defend station" mission (as seen on the dev livestream today), but also Hauramarca itself.

Solutions might include:

-Cutting the number of Earth Slavers (and also the wind slavers, to reduce the distraction to players)
-Buffing the hitpoints or defensive abilities of the Hauri stations
-Starting the attacking fleets further back (see https://ministry.kronosaur.com/record.hexm?id=8025 )

I would also suggest having the mission text edited to outright warn the player that the Earth slavers are the biggest threat to the station.