They are fine as they are now. Just their use is not understood by all.
They are meant to be using elite weapons that the solaris are !
Against other caps, they should be using a kind of super weapon (mortar) or call for bomber support (that's THEIR job)
Primary turrets should not really exists, we don't see battlecruisers pwn each other in Starwars, maybe targeting specific parts such as radar, maneuver bridge, weapon systems.
Destroyers :
They need really more fire power.
They are meant to kill big targets such as stations, so give them a damn bigger gun !
Gunboat :
The hard thing to balance. I'd say they are already well balanced, all weapons fit their role well but while some can't get hit by a bomber craft (BHG GS), some others are really good targets (Corsair GB, Rogue GB)
I'd say we need more the gunships than the gunboats.
Bombers :
DO NOT TOUCH THEM !
I've seen one idea about class 10 only guns and class 9 faster but I'll give my opinion later on it.
Very Heavy Fighters :
DO NOT TOUCH THEM !
Just make them use a razor and get close to their target before firing.
Heavy Fighters :
They need a few more hull, at least to resist a nuke + collision.
Lower the nuke mine damages is also an option to avoid hull change on that fighters.
Light Fighters :
====> Remove that damned torpedo from this Loki ! <====
Now I come to faster guns...
My opinion was to give the light fighter the speed they deserve not only on maneuvering but on weapons as well.
We can't hide it, to be efficient, a LF need class 8 guns and that's that guns I'd like to see faster (1000m/s) instead of class 9 ones.
They deal not enough damages for a VHF/Bomber pilot can mind use them so it will really fit the light fighters only, only the eagle/sabre will have to be "nerfed" to class 9 and 10 only since they are the ships that don't have heavy powercore, enough to make someone take class 8 guns.
HFs could use them as well I'd say, they are done to be faster isn't it ?
I know it's hard to get from people, but the fighter/bomber escort for BS are more their own weapons instead of their own they have mounted.
Primary>Mortar (Mortar simply use too damn much energy to fire, same for ALL other battleship weapons)
to fix this, just lower Mortar's energy usage