Battleships have been altered somewhat to help out with this. Their range has been reduced so turrets can shoot back despite the dampening. Try bunching up your turrets, so the battleships have to engage a group of turrets, not just one at a time. Spirebattle ships certainly require some adjustments in defenses to get used to.
As for the sounds, I may just turn them off eventually. As you said, I mainly hear units dying lately, simply because the galaxy is a violent place today. I mean it was violent in the past, but Light of Spire seems to have taken it to 11.