Ships:
I feel like destroyers and cruisers could use a bit more evasion, because it's not really enough to have a substantial impact.
Also, I found myself really wanting to be able to use ranges that aren't maximum range, but longer than 80. Being able to put things at a range of 120 would be useful.

Spinal Weapons:
Arc emitter is stupidly overpowered, its penetration and tracking more than makes up for the slightly lower damage and range. It's at least as effective against large targets as other spinal weapons. I don't think there's any way to make this weapon balanced without totally reworking what it does. It could be interesting if they were the opposite of what they are now: Instead of having ultra-high accuracy, they have ultra-low accuracy (50% with no tracking?), struggling to hit anything smaller than a battleship and even with battleships usually missing. It makes sense, as it's hard to aim lightning. To compensate, it could have a very high fire rate.
There's also not really any reason not to use spinal weapons, their vastly higher damage and range more than makes up for the slightly lower accuracy and tracking. Maybe lowering their tracking and/or accuracy, or improving evasion of destroyers and cruisers would fix that?

Missiles:
I found myself wondering, is it even realistic for missiles to do any damage? One PD slot puts out so much damage that you'd need like, a dozen missile slots to overwhelm it. Also, missiles and PD systems aren't distinct enough. I reckon they should be changed as such:
-Normal missiles: Pretty much as they are now, but with no evasion and a slightly higher fire rate.
-Swarmer missiles: Slightly higher fire rate and evasion, reduced range and damage to compensate.
-Torpedoes: Far higher health, low accuracy and zero tracking/evasion, also a slightly reduced range. It shouldn't realistically be able to hit corvettes and should struggle to hit even destroyers, but it should take a lot more PD than normal to deal with especially if fired from close-up.

Point Defence:
It's kinda hard to give a ship a reasonable amount of PD, since sections that give you any PD slots usually give you multiple. I reckon PD systems should be able to do significant (but still weakened) damage to ships, balanced out by them being less effective.
Also, how come flak and PD were changed to have exactly the same stats? In vanilla, flak has higher tracking but lower damage, meaning it has less DPS against missiles but can pretty much entirely negate the evasion of fighters. I don't think the game makes any inherent distinction between PD and flak, and they're only distinguished by their stats.

Fighters:
Why was their evasion reduced? When you combine that with regular PD having the same tracking as flak, they get quickly destroyed by anything that has any PD.
I feel like the way missiles and fighters are balanced is so they're incredibly punishing to fleets with no PD, but rendered useless by a tiny amount of PD.

And lastly Plasma Launcher, it's just not distinct enough from lasers.