Agree with a few points but also disagree with a few.
1. having Zzaps not stack would make them useless. 1-2 second slow is nothing alone considering Zzaps poor rate of fire.
As a compensation for it I would have given Zzaps faster firing and more tools for the Orks overall to close in.
It's always a package deal.
A proposed fix I had would be to modify the hit percentage of the Ignore sheilds Zzap upgrade dependant on distance. 50% at 9k, 33% at 12k, 25% at 15k. That way they are still a viable close-mid range catchup tool while removing the super-long ranged rediculousness.
That, too, could be a way, but I can see it being too rng reliant on Chaos 12-15k kiting fleets, unless you integreate more options to close in for the Orks or something that affects the stats of the enemy ship/s.
2. Mega Kannons and Heavy Kannons do need a buff that I agree, either by range or acess to the newly modified ap rounds.
My biggest issue with them is that when that one shot misses, then well...you have to wait quite a while until it can fire again.
The new rounds would just bring them to the state they were in before and that was a tad too strong.
That's why I suggested to give them more shots and maybe Zzaps the ability to reduce 75 armor to 50 for a few seconds (basically like their slow upgrade).
3. Launch Bays do need a reduced cost they are a bit expensive considering how bad ork bombers are, as of now they are only ok as fighter screens.
They are worse than other bombers, but theoretically you could put a Launch Bay on every Ork ship. With good bombers that would be a bit too strong
I would just decrease the Grot Ship Launchas in terms of point costs, adjust the other weapons at the same time and then see where it is going from here.
5. I disagree bringing costs back up, they seem to be perfectly priced now, taking into account their weaknesses from fires and hull breeches and slow speed.
Give them more tools to close in or skills that affect the stats of enemy ships, maybe a slight speed buff, reduce Launch Bay costs and reduce the Looted Ship trait to 50% and you can up the costs again.
It should be clear that if you don't address these things, then don't up their costs.
As said before, package deals.
Forgot something, but that's something that should be the case for every concerned faction:
De-link the prow weapons and the prow.
It's just dumb that one crit is able to destroy the amount of weaponry and for some ships/factions even "necessary" weapons.