I'm currently playing K2SO with your tweaks (and also xyrc's) and I'm having a blast so far

One thing that I'm stuck with right now though is that in Muluna it's really hard to produce blue circuits at scale, the only way to get rare metals is from lunar regolith digging which is super inefficient, for 1 circuit per second I'd require something like 64 moduled MK2 drills

Would you agree with adding either a way to get rare metals on Muluna or an alternative recipe for blue circuits? I think Muluna has aluminum and silicon recipes by default, but something is disabling these alternative recipes

I disabled my alternate recipes a while back:

• The processing unit via aluminum recipe was removed because Muluna 2.0.15 added rare metals from regrowth as an intended way to get it.
• The processing unit via silicon cells recipe was removed beause K2SO 1.5.6 for the same reason, plus because Moshine started getting rare metals from its mixed ore patches.

They still exist to be backwards compatible with existing factories.

I do agree the trickle of rare metals from regrowth digging is pretty abysmal. Even with common mk2 productivity modules (which you can reasonably design for at that initial stage) it only requires a trickle, <1/s rare metals. But that has insane amounts of byproducts just to get that.

I use locally, but haven't published, one alternative solution: modded asteroid reprocessing. It allows reprocessing between imersite, auric, and anorthite asteroids. But that also doesn't feel like a desired/intended extension from the original mod developers.