BAF Destroyer is a pretty good ship overall but it has fewest number of turrets in its class, only 2 of the heavy turrets can point backwards, and only half of the light turrets can point backwards. This gives it very limited capability against ships that get behind it, I have even lost to gunboat because I could not do more damage to it than it did to me from back there (this was with BAF turrets). The whole problem here is that it has few turrets to begin with, they are in awkward places (like under the snout), and very few of them have any rotation at all. By comparison, Rheinland cruiser has more turrets, in good locations, and most of them have full rotation. Even though the BAF destroyer is weird, I think the only tweak that is needed for balance is to give the side turrets full rotation (2 already have it, other 2 do not). It would also be nice to have the 3rd heavy turret get full rotation to make it the same as the others, but at a minimum the light turrets on the side should all point backwards.
LABC is OP. Look at the number of people buying them--if everybody uses something then it's OP. It has too many advantages: most turrets, ability to fire battleship weapons, huge powercore that can fire all weapons simultaneously, and a small profile. The profile and battleship mounts are all it needs. Delete two of the light turrets to bring its local defenses in line with other cruiser platforms, and cut the powecore by about 20% so it can fire the three battleship weapons but not every weapon.