Neinzul Enclave Starships 2 and 3 generally cost a lot of K for not that much effect by themselves. Well I agree that 10000 K for what amounts to the ability to build MK4 ships if you lose/don't have a factory 4 is nice. To get to them, you need to spend 18,000 K or a full 6 planets worth. I personally would like to see 2 or 3 just disappear and make that line only 3 ships longs. Ideally 2 so you can have the simple free MK1 builder that does not need supply, A mobile factory that does not need supply, and a mobile and rebuildable factory IV. As it is now, If I am going to unlock any in this line, then I am heading for 4, so I never build a single 2 or 3. I have 1s for minor building, but 4s tends to be very nice.
Cloaker Starships never seem to work that well for me, more so after shards became immune to cloaking.
The two Manufactories need a buff, unless stacks of 400+ that turn on/off so slow that I normally see that I have 999,999 +5000 metal and 1,204 -8000 crystals normally.
Harvester Exo-Sheilds... I never had a good reason to use them. Well I would like to stop rebuilding Harvesters after attacks, I can't afford to half the income of my resources to stop rebuilding them by the shields. Normally I end up far head if I let the AI kill my gathers and then rebuild them, then spend K and income on a Exo-Shield. Even if they were free, I might never use them as it is. If you have enough minerals coming in that you can(in theory) half you income, you are either playing an easy game or you need to go up higher.
With that in mind, Harvesters might need a bit of a combination buff. I get most of my income from the Economic Command Stations and Spire Habitation Centers. It rarely is worth the knowledge cost to do either lines. It comes out to 14500 K for both lines, and I get a lot more by spending 9000k for Eco 3 Stations and having 5500 for other stuff.
As for Turrets... I don't normally use them outside of whipping boys, so it hard for me to say if they need a buff or not. As all my experiences with them has been every turret that I have unlocked in a small area.
EDIT: made my suggestion a little clearer for people.